diff --git a/asm/overlay_01.s b/asm/overlay_01.s
index 852296ee4..6f59b1d17 100644
--- a/asm/overlay_01.s
+++ b/asm/overlay_01.s
@@ -37,7 +37,7 @@ ov01_021E5924: ; 0x021E5924
 	mov r1, #0
 	ldr r5, _021E5B9C ; =0x00DCE6A1
 	str r1, [sp, #4]
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	ldr r1, [r6]
 	add r4, r0, #0
 	cmp r1, #3
@@ -331,7 +331,7 @@ _021E5BE0: .word 0x00000578
 	thumb_func_start ov01_021E5BE4
 ov01_021E5BE4: ; 0x021E5BE4
 	push {r4, lr}
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	add r4, r0, #0
 	bl ov01_021E5ED4
 	cmp r0, #0
@@ -366,7 +366,7 @@ ov01_021E5C24: ; 0x021E5C24
 	push {r3, r4, r5, r6, r7, lr}
 	add r6, r1, #0
 	ldr r5, _021E5E7C ; =0x002AAACF
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	add r4, r0, #0
 	ldr r0, [r4, #0x2c]
 	bl ov01_021F50F0
diff --git a/asm/overlay_100.s b/asm/overlay_100.s
index efd6af4ab..9bce1996b 100644
--- a/asm/overlay_100.s
+++ b/asm/overlay_100.s
@@ -1435,7 +1435,7 @@ _021E6428:
 ov100_Phone_OvyInit: ; 0x021E642C
 	push {r3, r4, r5, lr}
 	add r4, r0, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	add r5, r0, #0
 	mov r0, #0
 	bl sub_0200616C
diff --git a/asm/overlay_101.s b/asm/overlay_101.s
index 011d384e8..cf1b8bfab 100644
--- a/asm/overlay_101.s
+++ b/asm/overlay_101.s
@@ -14,7 +14,7 @@
 ov101_021E7740: ; 0x021E7740
 	push {r3, r4, r5, lr}
 	add r4, r0, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	add r5, r0, #0
 	ldr r0, _021E7790 ; =SDK_OVERLAY_OVY_26_ID
 	mov r1, #2
@@ -12472,7 +12472,7 @@ _021ED7E4:
 ov101_TownMap_OvyInit: ; 0x021ED7F8
 	push {r3, r4, r5, lr}
 	add r4, r0, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	add r5, r0, #0
 	ldr r0, _021ED8A4 ; =SDK_OVERLAY_OVY_100_ID
 	mov r1, #2
@@ -14532,7 +14532,7 @@ _021EE8E4: .word 0x00030100
 ov101_021EE8E8: ; 0x021EE8E8
 	push {r3, r4, r5, lr}
 	add r4, r0, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	mov r2, #2
 	add r5, r0, #0
 	mov r0, #3
@@ -16531,7 +16531,7 @@ _021EF844: .word 0x00000941
 ov101_021EF848: ; 0x021EF848
 	push {r3, r4, r5, lr}
 	add r4, r0, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	add r5, r0, #0
 	mov r0, #3
 	mov r1, #0x5b
@@ -26616,7 +26616,7 @@ _021F447C: .word 0x0000099F
 ov101_021F4480: ; 0x021F4480
 	push {r3, r4, r5, lr}
 	add r4, r0, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	mov r2, #2
 	add r5, r0, #0
 	mov r0, #3
diff --git a/asm/overlay_102.s b/asm/overlay_102.s
index 284d16466..5d018b184 100644
--- a/asm/overlay_102.s
+++ b/asm/overlay_102.s
@@ -193,7 +193,7 @@ ov102_021E7888: ; 0x021E7888
 	add r4, r0, #0
 	bl MI_CpuFill8
 	add r0, r5, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	str r0, [r4]
 	bl sub_02090D70
 	str r0, [r4, #4]
diff --git a/asm/overlay_103.s b/asm/overlay_103.s
index a6c7bdfc1..84113b23b 100644
--- a/asm/overlay_103.s
+++ b/asm/overlay_103.s
@@ -21,7 +21,7 @@ ov103_021EC940: ; 0x021EC940
 	add r4, r0, #0
 	bl MI_CpuFill8
 	add r0, r5, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	str r0, [r4, #8]
 	ldr r0, [r0]
 	bl Sav2_PlayerData_GetOptionsAddr
diff --git a/asm/overlay_104.s b/asm/overlay_104.s
index 6df1aa911..ce5ae2f96 100644
--- a/asm/overlay_104.s
+++ b/asm/overlay_104.s
@@ -24,7 +24,7 @@ ov104_021E5900: ; 0x021E5900
 	add r4, r0, #0
 	bl memset
 	add r0, r5, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	add r5, r0, #0
 	mov r0, #0x59
 	ldrb r1, [r5]
diff --git a/asm/overlay_105.s b/asm/overlay_105.s
index 2861fee49..f1049bd15 100644
--- a/asm/overlay_105.s
+++ b/asm/overlay_105.s
@@ -22,7 +22,7 @@ ov105_021E5900: ; 0x021E5900
 	add r4, r0, #0
 	bl memset
 	add r0, r5, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	add r5, r0, #0
 	add r0, r4, #0
 	ldrb r1, [r5]
diff --git a/asm/overlay_108.s b/asm/overlay_108.s
index 3d97dbb26..bb2b492ea 100644
--- a/asm/overlay_108.s
+++ b/asm/overlay_108.s
@@ -7,7 +7,7 @@
 ov108_021E5900: ; 0x021E5900
 	push {r3, r4, r5, lr}
 	add r4, r0, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	mov r2, #5
 	add r5, r0, #0
 	mov r0, #3
@@ -5979,7 +5979,7 @@ _021E8862:
 	lsl r2, r2, #0xe
 	bl CreateHeap
 	add r0, r4, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	mov r1, #0x53
 	add r6, r0, #0
 	add r0, r4, #0
diff --git a/asm/overlay_109.s b/asm/overlay_109.s
index e835aa6a3..620aa54b2 100644
--- a/asm/overlay_109.s
+++ b/asm/overlay_109.s
@@ -34,7 +34,7 @@ _021E5912:
 	mov r0, #0x60
 	str r0, [r4]
 	add r0, r6, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	str r0, [r4, #0x10]
 	add r0, r4, #0
 	bl ov109_021E5A70
diff --git a/asm/overlay_110.s b/asm/overlay_110.s
index f2b6dd841..7c2d5223c 100644
--- a/asm/overlay_110.s
+++ b/asm/overlay_110.s
@@ -35,7 +35,7 @@ _021E5912:
 	mov r0, #0x61
 	str r0, [r4]
 	add r0, r6, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	mov r1, #0
 	str r0, [r4, #0x10]
 	mov r0, #0x4a
diff --git a/asm/overlay_111.s b/asm/overlay_111.s
index cf1081861..df1256bae 100644
--- a/asm/overlay_111.s
+++ b/asm/overlay_111.s
@@ -699,7 +699,7 @@ ov111_021E5E34: ; 0x021E5E34
 	push {r3, r4, r5, lr}
 	sub sp, #8
 	add r4, r0, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	add r5, r0, #0
 	bne _021E5E46
 	bl GF_AssertFail
diff --git a/asm/overlay_112.s b/asm/overlay_112.s
index 443abc5b9..6b7158851 100644
--- a/asm/overlay_112.s
+++ b/asm/overlay_112.s
@@ -3946,7 +3946,7 @@ ov112_021E76CC: ; 0x021E76CC
 	add r5, r0, #0
 	bl memset
 	add r0, r4, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	ldr r0, [r0, #8]
 	str r0, [r5, #0x20]
 	add r0, r5, #0
@@ -26674,7 +26674,7 @@ _021F2DE0: .word 0xFFFFFBFF
 ov112_021F2DE4: ; 0x021F2DE4
 	push {r3, r4, r5, lr}
 	add r4, r0, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	add r5, r0, #0
 	bne _021F2DF4
 	bl GF_AssertFail
diff --git a/asm/overlay_113.s b/asm/overlay_113.s
index 6d0c6aedd..b5711acb6 100644
--- a/asm/overlay_113.s
+++ b/asm/overlay_113.s
@@ -34,7 +34,7 @@ _021E5912:
 	mov r0, #0x98
 	str r0, [r4]
 	add r0, r6, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	str r0, [r4, #4]
 	add r0, r4, #0
 	bl ov113_021E5A7C
diff --git a/asm/overlay_12.s b/asm/overlay_12.s
index 046193d9e..be7805287 100644
--- a/asm/overlay_12.s
+++ b/asm/overlay_12.s
@@ -10,7 +10,7 @@ ov12_022378C0: ; 0x022378C0
 	sub sp, #0x24
 	add r4, r1, #0
 	add r6, r0, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	ldr r1, [r4]
 	add r5, r0, #0
 	cmp r1, #0xf
@@ -755,7 +755,7 @@ ov12_02237F18: ; 0x02237F18
 	bl OverlayManager_GetData
 	add r4, r0, #0
 	add r0, r5, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	add r7, r0, #0
 	bl sub_02026E8C
 	add r5, r0, #0
@@ -1320,7 +1320,7 @@ ov12_0223843C: ; 0x0223843C
 	bl OverlayManager_GetData
 	add r4, r0, #0
 	add r0, r5, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	ldr r3, _02238778 ; =0x0000244C
 	mov r2, #0x67
 	ldr r1, [r4, r3]
@@ -4771,7 +4771,7 @@ ov12_0223A0D4: ; 0x0223A0D4
 	bl OverlayManager_CreateAndGetData
 	add r4, r0, #0
 	add r0, r5, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	add r5, r0, #0
 	ldr r2, _0223A20C ; =0x00002490
 	mov r0, #0
@@ -4970,7 +4970,7 @@ ov12_0223A260: ; 0x0223A260
 	bl OverlayManager_GetData
 	add r4, r0, #0
 	add r0, r5, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	ldr r0, [r4, #0x2c]
 	mov r1, #4
 	tst r1, r0
@@ -5163,7 +5163,7 @@ _0223A3EA:
 ov12_0223A3F0: ; 0x0223A3F0
 	push {r4, r5, r6, r7, lr}
 	sub sp, #0xc
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	add r7, r0, #0
 	ldr r0, [r7]
 	mov r1, #4
@@ -5405,7 +5405,7 @@ _0223A5E0: .word 0x000001B2
 	thumb_func_start ov12_0223A5E4
 ov12_0223A5E4: ; 0x0223A5E4
 	push {r4, r5, r6, lr}
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	mov r1, #0x66
 	lsl r1, r1, #2
 	ldr r6, [r0, r1]
diff --git a/asm/overlay_121.s b/asm/overlay_121.s
index 8d188f69a..cfdeb5770 100644
--- a/asm/overlay_121.s
+++ b/asm/overlay_121.s
@@ -232,7 +232,7 @@ _021E5AE8: .word 0x0000025E
 ov121_021E5AEC: ; 0x021E5AEC
 	push {r3, r4, r5, lr}
 	add r5, r0, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	mov r2, #1
 	add r4, r0, #0
 	mov r0, #3
diff --git a/asm/overlay_122.s b/asm/overlay_122.s
index c0ce5dbfe..b0cef6e89 100644
--- a/asm/overlay_122.s
+++ b/asm/overlay_122.s
@@ -5106,7 +5106,7 @@ _021E8090: .word 0x04001000
 ov122_021E8094: ; 0x021E8094
 	push {r3, r4, r5, lr}
 	add r4, r0, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	add r5, r0, #0
 	bne _021E80A4
 	bl GF_AssertFail
diff --git a/asm/overlay_124.s b/asm/overlay_124.s
index 500e5d524..b831ee9e7 100644
--- a/asm/overlay_124.s
+++ b/asm/overlay_124.s
@@ -26,7 +26,7 @@ _02260C42:
 	mul r0, r1
 	add r4, r4, r0
 	add r0, r6, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	ldr r0, [r0, #8]
 	str r0, [r5, #0xc]
 	mov r0, #0
diff --git a/asm/overlay_14.s b/asm/overlay_14.s
index b84fa045f..06c0e13c5 100644
--- a/asm/overlay_14.s
+++ b/asm/overlay_14.s
@@ -21,7 +21,7 @@ ov14_021E5900: ; 0x021E5900
 	add r4, r0, #0
 	bl MI_CpuFill8
 	add r0, r5, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	str r0, [r4]
 	ldr r0, [r0]
 	bl GetStoragePCPointer
diff --git a/asm/overlay_15.s b/asm/overlay_15.s
index 591b6fef8..eb0c41b02 100644
--- a/asm/overlay_15.s
+++ b/asm/overlay_15.s
@@ -46,7 +46,7 @@ ov15_BagApp_init: ; 0x021F9380
 	add r4, r0, #0
 	bl memset
 	add r0, r5, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	mov r1, #0x8d
 	lsl r1, r1, #2
 	str r0, [r4, r1]
diff --git a/asm/overlay_16.s b/asm/overlay_16.s
index 07c47879e..42f9a9821 100644
--- a/asm/overlay_16.s
+++ b/asm/overlay_16.s
@@ -803,7 +803,7 @@ ov16_0220196C: ; 0x0220196C
 	mov r0, #0x82
 	str r0, [r4]
 	add r0, r5, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	str r0, [r4, #4]
 	add r0, r4, #0
 	bl ov16_02201A34
diff --git a/asm/overlay_17.s b/asm/overlay_17.s
index 7ec1a0401..e6010334f 100644
--- a/asm/overlay_17.s
+++ b/asm/overlay_17.s
@@ -69,7 +69,7 @@ _02201C22:
 	mov r0, #0x83
 	str r0, [r4]
 	add r0, r6, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	str r0, [r4, #4]
 	add r0, r4, #0
 	bl ov17_02201D30
diff --git a/asm/overlay_18.s b/asm/overlay_18.s
index 2c3d8b107..f38221da0 100644
--- a/asm/overlay_18.s
+++ b/asm/overlay_18.s
@@ -262,7 +262,7 @@ ov18_021E5AA0: ; 0x021E5AA0
 	add r4, r0, #0
 	bl MI_CpuFill8
 	add r0, r5, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	str r0, [r4]
 	ldr r0, _021E5B50 ; =0x0000085C
 	mov r1, #5
diff --git a/asm/overlay_36.s b/asm/overlay_36.s
index 21d0371a4..03e431fae 100644
--- a/asm/overlay_36.s
+++ b/asm/overlay_36.s
@@ -20,7 +20,7 @@ ov36_021E5900: ; 0x021E5900
 	thumb_func_start ov36_021E5918
 ov36_021E5918: ; 0x021E5918
 	push {r3, lr}
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	ldr r1, [r0, #8]
 	mov r0, #0x4b
 	bl ov36_021E5BC8
@@ -63,7 +63,7 @@ ov36_021E5948: ; 0x021E5948
 	thumb_func_start ov36_021E5960
 ov36_021E5960: ; 0x021E5960
 	push {r4, lr}
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	ldr r4, [r0, #8]
 	mov r0, #0x4b
 	add r1, r4, #0
@@ -110,7 +110,7 @@ ov36_021E599C: ; 0x021E599C
 	thumb_func_start ov36_021E59B4
 ov36_021E59B4: ; 0x021E59B4
 	push {r3, r4, r5, lr}
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	ldr r4, [r0, #8]
 	add r0, r4, #0
 	bl Sav2_SysInfo_get
diff --git a/asm/overlay_37.s b/asm/overlay_37.s
index d37839017..d64c02b09 100644
--- a/asm/overlay_37.s
+++ b/asm/overlay_37.s
@@ -82,7 +82,7 @@ _021E5916:
 	add r3, r0, #0
 	bl sub_0200FA24
 	add r0, r6, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	str r0, [r4, #8]
 	mov r0, #0x4e
 	mov r1, #0x27
@@ -302,7 +302,7 @@ ov37_021E5B94: ; 0x021E5B94
 	bl OverlayManager_GetData
 	add r6, r0, #0
 	add r0, r4, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	add r5, r0, #0
 	ldr r0, [r7]
 	cmp r0, #3
diff --git a/asm/overlay_39_thumb.s b/asm/overlay_39_thumb.s
index b91d78901..3c70c061a 100644
--- a/asm/overlay_39_thumb.s
+++ b/asm/overlay_39_thumb.s
@@ -2410,7 +2410,7 @@ ov39_02228140: ; 0x02228140
 	add r5, r0, #0
 	bl MI_CpuFill8
 	add r0, r4, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	str r0, [r5]
 	mov r0, #0x7c
 	bl BgConfig_Alloc
diff --git a/asm/overlay_41.s b/asm/overlay_41.s
index 4c033632a..7d7f56f54 100644
--- a/asm/overlay_41.s
+++ b/asm/overlay_41.s
@@ -2083,7 +2083,7 @@ ov41_02246DE0: ; 0x02246DE0
 	bl Main_SetVBlankIntrCB
 	bl HBlankInterruptDisable
 	add r0, r5, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	add r5, r0, #0
 	ldr r0, [r5, #0xc]
 	ldr r1, _02246EF4 ; =0x000006DC
@@ -2188,7 +2188,7 @@ ov41_02246F08: ; 0x02246F08
 	add r4, r0, #0
 	add r0, r7, #0
 	mov r6, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	ldr r1, [r5]
 	cmp r1, #0xc
 	bhi _02246FD6
@@ -2470,7 +2470,7 @@ ov41_02247150: ; 0x02247150
 	bl OverlayManager_GetData
 	add r4, r0, #0
 	add r0, r6, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	add r5, r0, #0
 	mov r0, #0x1b
 	lsl r0, r0, #6
@@ -12399,7 +12399,7 @@ ov41_0224BA10: ; 0x0224BA10
 	bl Main_SetVBlankIntrCB
 	bl HBlankInterruptDisable
 	add r0, r4, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	add r4, r0, #0
 	ldr r0, [r4]
 	ldr r1, [r4, #4]
diff --git a/asm/overlay_43.s b/asm/overlay_43.s
index 841b99d92..4f3c0d4d8 100644
--- a/asm/overlay_43.s
+++ b/asm/overlay_43.s
@@ -24,7 +24,7 @@ ov43_02229EE0: ; 0x02229EE0
 	add r4, r0, #0
 	bl memset
 	add r0, r5, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	mov r1, #0x9f
 	lsl r1, r1, #2
 	str r0, [r4, r1]
diff --git a/asm/overlay_44.s b/asm/overlay_44.s
index d44d3d728..39503de80 100644
--- a/asm/overlay_44.s
+++ b/asm/overlay_44.s
@@ -843,7 +843,7 @@ ov44_0222A4B4: ; 0x0222A4B4
 _0222A4C8:
 	b _0222A600
 _0222A4CA:
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	add r4, r0, #0
 	bl sub_02039998
 	cmp r0, #0
@@ -1156,7 +1156,7 @@ ov44_0222A758: ; 0x0222A758
 	add r4, r0, #0
 	bl ov44_0222A68C
 	add r0, r5, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	add r6, r0, #0
 	mov r0, #0xd3
 	lsl r0, r0, #2
@@ -18241,7 +18241,7 @@ _02232EA4: .word ov44_0223688C
 ov44_02232EA8: ; 0x02232EA8
 	push {r3, r4, r5, lr}
 	add r4, r0, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	add r5, r0, #0
 	ldr r0, _02232F5C ; =SDK_OVERLAY_OVY_42_ID
 	mov r1, #2
@@ -18325,7 +18325,7 @@ ov44_02232F64: ; 0x02232F64
 	bl OverlayManager_GetData
 	add r4, r0, #0
 	add r0, r6, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	add r7, r0, #0
 	ldr r0, [r5]
 	cmp r0, #4
@@ -18482,7 +18482,7 @@ ov44_022330A8: ; 0x022330A8
 	bl OverlayManager_GetData
 	add r4, r0, #0
 	add r0, r5, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	mov r0, #0
 	add r1, r0, #0
 	bl Main_SetVBlankIntrCB
diff --git a/asm/overlay_45_thumb.s b/asm/overlay_45_thumb.s
index e7df41a3c..30ef1b2f7 100644
--- a/asm/overlay_45_thumb.s
+++ b/asm/overlay_45_thumb.s
@@ -33,7 +33,7 @@ _02229F18:
 	sub r1, r1, #1
 	bne _02229F18
 	add r0, r4, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	add r4, r0, #0
 	ldr r0, [r4, #4]
 	mov r1, #0x6f
diff --git a/asm/overlay_46.s b/asm/overlay_46.s
index 729631237..fc2d04aea 100644
--- a/asm/overlay_46.s
+++ b/asm/overlay_46.s
@@ -22,7 +22,7 @@ ov46_02258800: ; 0x02258800
 	add r5, r0, #0
 	bl memset
 	add r0, r4, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	add r4, r0, #0
 	ldr r0, [r4]
 	ldr r1, _0225891C ; =0x0000047D
@@ -148,7 +148,7 @@ ov46_0225892C: ; 0x0225892C
 	bl OverlayManager_GetData
 	add r5, r0, #0
 	add r0, r6, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	add r6, r0, #0
 	ldr r0, [r4]
 	cmp r0, #0xf
@@ -581,7 +581,7 @@ ov46_02258CB4: ; 0x02258CB4
 	add r4, r0, #0
 	bl memset
 	add r0, r5, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	ldr r0, [r0]
 	mov r1, #0x77
 	str r0, [r4]
@@ -680,7 +680,7 @@ ov46_02258DA8: ; 0x02258DA8
 	bl OverlayManager_GetData
 	add r5, r0, #0
 	add r0, r6, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	add r6, r0, #0
 	ldr r0, [r4]
 	cmp r0, #0xa
diff --git a/asm/overlay_47.s b/asm/overlay_47.s
index b96c90922..acec43741 100644
--- a/asm/overlay_47.s
+++ b/asm/overlay_47.s
@@ -8,7 +8,7 @@ ov47_02258800: ; 0x02258800
 	push {r3, r4, r5, r6, lr}
 	sub sp, #4
 	add r4, r0, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	mov r2, #5
 	add r5, r0, #0
 	mov r0, #3
@@ -82,7 +82,7 @@ ov47_02258898: ; 0x02258898
 	bl OverlayManager_GetData
 	add r7, r0, #0
 	add r0, r5, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	add r5, r0, #0
 	ldr r0, [r4]
 	cmp r0, #4
@@ -215,7 +215,7 @@ ov47_022589A8: ; 0x022589A8
 	bl OverlayManager_GetData
 	add r4, r0, #0
 	add r0, r5, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	add r6, r0, #0
 	mov r0, #0
 	add r1, r0, #0
diff --git a/asm/overlay_48.s b/asm/overlay_48.s
index ba11a5691..5b9ade9bd 100644
--- a/asm/overlay_48.s
+++ b/asm/overlay_48.s
@@ -8,7 +8,7 @@ ov48_02258800: ; 0x02258800
 	push {r3, r4, r5, lr}
 	sub sp, #8
 	add r4, r0, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	mov r2, #5
 	add r5, r0, #0
 	mov r0, #3
@@ -135,7 +135,7 @@ ov48_02258920: ; 0x02258920
 	bl OverlayManager_GetData
 	add r7, r0, #0
 	add r0, r5, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	add r5, r0, #0
 	ldr r0, [r4]
 	cmp r0, #6
@@ -243,7 +243,7 @@ ov48_022589FC: ; 0x022589FC
 	bl OverlayManager_GetData
 	add r4, r0, #0
 	add r0, r5, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	mov r0, #0
 	add r1, r0, #0
 	bl Main_SetVBlankIntrCB
diff --git a/asm/overlay_49.s b/asm/overlay_49.s
index 4af62f0fb..9476adb62 100644
--- a/asm/overlay_49.s
+++ b/asm/overlay_49.s
@@ -2587,7 +2587,7 @@ ov49_02259AA4: ; 0x02259AA4
 	push {r3, r4, r5, lr}
 	sub sp, #8
 	add r4, r0, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	mov r2, #0x3a
 	add r5, r0, #0
 	mov r0, #3
@@ -2806,7 +2806,7 @@ ov49_02259C90: ; 0x02259C90
 	bl OverlayManager_GetData
 	add r4, r0, #0
 	add r0, r6, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	ldr r0, [r5]
 	cmp r0, #8
 	bhi _02259D58
@@ -3106,7 +3106,7 @@ ov49_02259EF8: ; 0x02259EF8
 	bl OverlayManager_GetData
 	add r4, r0, #0
 	add r0, r5, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	ldrb r1, [r4, #1]
 	str r1, [r0, #0x18]
 	mov r0, #0
diff --git a/asm/overlay_53.s b/asm/overlay_53.s
index f60624cd3..14380825b 100644
--- a/asm/overlay_53.s
+++ b/asm/overlay_53.s
@@ -28,7 +28,7 @@ ov53_OakSpeech_OvyInit: ; 0x021E5900
 	mov r0, #0x50
 	str r0, [r4]
 	add r0, r5, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	ldr r0, [r0, #8]
 	str r0, [r4, #4]
 	bl Sav2_PlayerData_GetOptionsAddr
diff --git a/asm/overlay_54.s b/asm/overlay_54.s
index a83377f04..64e905949 100644
--- a/asm/overlay_54.s
+++ b/asm/overlay_54.s
@@ -7,7 +7,7 @@
 ov54_021E5900: ; 0x021E5900
 	push {r3, r4, r5, lr}
 	add r4, r0, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	add r5, r0, #0
 	mov r0, #3
 	mov r1, #0x26
diff --git a/asm/overlay_55.s b/asm/overlay_55.s
index 4cdec5a94..6eeb8e4ed 100644
--- a/asm/overlay_55.s
+++ b/asm/overlay_55.s
@@ -28,7 +28,7 @@ _021E5920:
 ov55_021E5924: ; 0x021E5924
 	push {r3, r4, r5, lr}
 	add r4, r0, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	mov r2, #1
 	add r5, r0, #0
 	mov r0, #3
@@ -85,7 +85,7 @@ ov55_021E598C: ; 0x021E598C
 	bl OverlayManager_GetData
 	add r4, r0, #0
 	add r0, r5, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	add r5, r0, #0
 	ldr r0, [r6]
 	cmp r0, #4
diff --git a/asm/overlay_56.s b/asm/overlay_56.s
index e1f26d565..8afbecfb0 100644
--- a/asm/overlay_56.s
+++ b/asm/overlay_56.s
@@ -23,7 +23,7 @@ ov56_021E5C20: ; 0x021E5C20
 	mov r0, #0x29
 	str r0, [r4]
 	add r0, r5, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	str r0, [r4, #0x1c]
 	ldrh r0, [r0]
 	ldr r1, _021E5C98 ; =0x0000FFFF
diff --git a/asm/overlay_57.s b/asm/overlay_57.s
index 81e119161..8d2286f57 100644
--- a/asm/overlay_57.s
+++ b/asm/overlay_57.s
@@ -38,7 +38,7 @@ ov57_022378DC: ; 0x022378DC
 	add r4, r0, #0
 	bl memset
 	add r0, r5, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	str r0, [r4]
 	mov r0, #0xb4
 	mov r1, #0x34
diff --git a/asm/overlay_58.s b/asm/overlay_58.s
index fb157d311..53ed046e8 100644
--- a/asm/overlay_58.s
+++ b/asm/overlay_58.s
@@ -45,7 +45,7 @@ ov58_022378E4: ; 0x022378E4
 	mov r0, #0x85
 	str r0, [r4]
 	add r0, r5, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	str r0, [r4, #4]
 	add r0, r4, #0
 	bl ov58_02237B40
diff --git a/asm/overlay_59.s b/asm/overlay_59.s
index 00ce451d4..4a516c3f8 100644
--- a/asm/overlay_59.s
+++ b/asm/overlay_59.s
@@ -34,7 +34,7 @@ _02237D52:
 	mov r0, #0x86
 	str r0, [r4]
 	add r0, r6, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	str r0, [r4, #4]
 	add r0, r4, #0
 	bl ov59_02237E94
@@ -5682,7 +5682,7 @@ _0223A8F2:
 	mov r0, #0x86
 	str r0, [r4]
 	add r0, r6, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	str r0, [r4, #4]
 	add r0, r4, #0
 	bl ov59_0223A9E4
diff --git a/asm/overlay_61.s b/asm/overlay_61.s
index 9f33d0655..cd0c4c093 100644
--- a/asm/overlay_61.s
+++ b/asm/overlay_61.s
@@ -33,7 +33,7 @@ ChooseStarterApplication_OvyInit: ; 0x021E5900
 	str r1, [r4, #4]
 	bl GF_ExpHeap_FndInitAllocator
 	add r0, r5, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	add r5, r0, #0
 	ldr r0, [r5, #4]
 	bl Options_GetFrame
@@ -767,7 +767,7 @@ ChooseStarterApplication_OvyExit: ; 0x021E5F74
 	bl OverlayManager_GetData
 	add r4, r0, #0
 	add r0, r5, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	add r6, r0, #0
 	mov r0, #0
 	bl TextFlags_SetCanABSpeedUpPrint
diff --git a/asm/overlay_63.s b/asm/overlay_63.s
index 5d1075629..249d3dd45 100644
--- a/asm/overlay_63.s
+++ b/asm/overlay_63.s
@@ -38,7 +38,7 @@ ov63_0221BE20: ; 0x0221BE20
 	add r5, r0, #0
 	bl MI_CpuFill8
 	add r0, r4, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	str r0, [r5]
 	mov r0, #0
 	mov r1, #0x1b
diff --git a/asm/overlay_64.s b/asm/overlay_64.s
index d92f8ce60..ee7b99077 100644
--- a/asm/overlay_64.s
+++ b/asm/overlay_64.s
@@ -44,7 +44,7 @@ ov64_021E5900: ; 0x021E5900
 	add r4, r0, #0
 	bl MI_CpuFill8
 	add r0, r5, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	str r0, [r4]
 	bl Sav2_HOF_GetNumRecords
 	mov r1, #0x6e
diff --git a/asm/overlay_65.s b/asm/overlay_65.s
index c1243e46a..17413388f 100644
--- a/asm/overlay_65.s
+++ b/asm/overlay_65.s
@@ -1816,7 +1816,7 @@ ov65_0221CD74: ; 0x0221CD74
 	bl OverlayManager_GetData
 	add r4, r0, #0
 	add r0, r5, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	ldr r1, [r4, #0x68]
 	str r1, [r0, #0x24]
 	add r0, r4, #0
@@ -2212,7 +2212,7 @@ ov65_0221D0EC: ; 0x0221D0EC
 	push {r4, r5, r6, lr}
 	add r5, r0, #0
 	add r0, r1, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	add r4, r0, #0
 	mov r2, #6
 	ldr r0, _0221D1B0 ; =0x00000674
diff --git a/asm/overlay_67.s b/asm/overlay_67.s
index 3f7f8558f..516f67c08 100644
--- a/asm/overlay_67.s
+++ b/asm/overlay_67.s
@@ -7,7 +7,7 @@
 ov67_021E5900: ; 0x021E5900
 	push {r3, r4, r5, lr}
 	add r4, r0, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	mov r2, #2
 	add r5, r0, #0
 	mov r0, #3
diff --git a/asm/overlay_68.s b/asm/overlay_68.s
index 8c8324f44..2057aff1b 100644
--- a/asm/overlay_68.s
+++ b/asm/overlay_68.s
@@ -23,7 +23,7 @@ ov68_021E5900: ; 0x021E5900
 	add r4, r0, #0
 	bl memset
 	add r0, r5, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	str r0, [r4]
 	add r0, r4, #0
 	bl ov68_021E5A58
diff --git a/asm/overlay_69.s b/asm/overlay_69.s
index 0a2683d8c..d198d28c8 100644
--- a/asm/overlay_69.s
+++ b/asm/overlay_69.s
@@ -52,7 +52,7 @@ _021E5960:
 	lsl r0, r0, #8
 	str r1, [r5, r0]
 	add r0, r4, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	add r4, r0, #0
 	bl sub_0202CA44
 	str r0, [r5, #4]
diff --git a/asm/overlay_70.s b/asm/overlay_70.s
index 3a5a6d551..0619765f3 100644
--- a/asm/overlay_70.s
+++ b/asm/overlay_70.s
@@ -1983,7 +1983,7 @@ ov70_02238818: ; 0x02238818
 	push {r4, lr}
 	add r4, r0, #0
 	add r0, r1, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	mov r1, #0
 	str r0, [r4]
 	add r0, r4, #0
diff --git a/asm/overlay_71.s b/asm/overlay_71.s
index 6e0fc1e33..1aac7666d 100644
--- a/asm/overlay_71.s
+++ b/asm/overlay_71.s
@@ -37,7 +37,7 @@ _02246970:
 	b _02246B06
 _022469A6:
 	add r0, r5, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	str r0, [r4]
 	mov r0, #0
 	str r0, [r4, #4]
diff --git a/asm/overlay_72.s b/asm/overlay_72.s
index 4aa288410..4a25951a1 100644
--- a/asm/overlay_72.s
+++ b/asm/overlay_72.s
@@ -1091,7 +1091,7 @@ ov72_02238144: ; 0x02238144
 	push {r4, lr}
 	add r4, r0, #0
 	add r0, r1, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	mov r1, #0
 	str r0, [r4]
 	add r0, r4, #0
diff --git a/asm/overlay_73.s b/asm/overlay_73.s
index 916484485..e13a79b0b 100644
--- a/asm/overlay_73.s
+++ b/asm/overlay_73.s
@@ -55,7 +55,7 @@ _021E5916:
 	bl BgConfig_Alloc
 	str r0, [r4]
 	add r0, r7, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	str r0, [r4, #8]
 	ldr r1, [r0]
 	ldr r0, _021E5AA0 ; =0x00004A0C
@@ -5114,7 +5114,7 @@ ov73_021E8148: ; 0x021E8148
 	push {r4, lr}
 	add r4, r0, #0
 	add r0, r1, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	mov r1, #0
 	str r0, [r4]
 	add r0, r4, #0
diff --git a/asm/overlay_74_thumb.s b/asm/overlay_74_thumb.s
index 8ce4c0a55..6e2e89d62 100644
--- a/asm/overlay_74_thumb.s
+++ b/asm/overlay_74_thumb.s
@@ -3192,7 +3192,7 @@ ov74_MainMenu_AppInit: ; 0x02228920
 	mov r1, #0
 	bl sub_0200FBF4
 	add r0, r5, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	ldr r0, [r0, #8]
 	str r0, [r4, #4]
 	bl Save_MysteryGift_get
@@ -4241,7 +4241,7 @@ ov74_02229200: ; 0x02229200
 	bl BgConfig_Alloc
 	str r0, [r4, #4]
 	add r0, r5, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	ldr r0, [r0, #8]
 	str r0, [r4, #8]
 	bl Sav2_PlayerData_GetProfileAddr
@@ -5611,7 +5611,7 @@ ov74_02229D1C: ; 0x02229D1C
 	cmp r0, #0
 	bne _02229D48
 	bl ov74_0222CD7C
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	ldr r0, [r0, #8]
 	add r1, r4, #0
 	bl sub_02038148
@@ -6216,7 +6216,7 @@ ov74_0222A174: ; 0x0222A174
 	add r0, r6, #0
 	add r4, #0x8c
 	add r5, #0xdc
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	ldr r0, [r0, #8]
 	str r0, [sp]
 	add r0, r4, #0
@@ -7893,7 +7893,7 @@ _0222AEE8:
 	mov r1, #0x1d
 	str r1, [r4, r0]
 	add r0, r5, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	ldr r0, [r0, #8]
 	str r0, [r4, #4]
 	bl Sav2_PlayerData_GetOptionsAddr
@@ -14267,7 +14267,7 @@ _0222E216: ; jump table
 	.short _0222E79C - _0222E216 - 2 ; case 30
 _0222E254:
 	add r0, r6, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	ldr r1, [r0, #8]
 	ldr r0, _0222E5A4 ; =0x00002BA4
 	str r1, [r4, r0]
@@ -16942,7 +16942,7 @@ _0222F7F6: ; jump table
 	.short _0222FB2C - _0222F7F6 - 2 ; case 30
 _0222F834:
 	add r0, r6, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	ldr r1, [r0, #8]
 	ldr r0, _0222FB50 ; =0x00002BA4
 	str r1, [r4, r0]
@@ -24546,7 +24546,7 @@ ov74_02233230: ; 0x02233230
 	mov r1, #0
 	bl sub_0200FBF4
 	add r0, r5, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	ldr r0, [r0, #8]
 	str r0, [r4, #0x10]
 	bl Sav2_PlayerData_GetProfileAddr
diff --git a/asm/overlay_75.s b/asm/overlay_75.s
index 00d1a5dbb..d0cb5d06a 100644
--- a/asm/overlay_75.s
+++ b/asm/overlay_75.s
@@ -29,7 +29,7 @@ ov75_02246960: ; 0x02246960
 	add r4, r0, #0
 	bl MI_CpuFill8
 	add r0, r5, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	ldr r0, [r0, #8]
 	str r0, [r4, #4]
 	bl Sav2_PlayerData_GetOptionsAddr
@@ -825,7 +825,7 @@ ov75_02246F0C: ; 0x02246F0C
 	add r5, r0, #0
 	bl MI_CpuFill8
 	add r0, r4, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	str r0, [r5]
 	mov r0, #0x74
 	bl BgConfig_Alloc
diff --git a/asm/overlay_76.s b/asm/overlay_76.s
index 84ab34c09..5372a1d1d 100644
--- a/asm/overlay_76.s
+++ b/asm/overlay_76.s
@@ -54,7 +54,7 @@ _021E5936:
 	str r0, [r2]
 	bl ov76_021E5DA4
 	add r0, r6, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	str r0, [r4, #0x10]
 	mov r0, #0
 	str r0, [r4, #0x14]
diff --git a/asm/overlay_78.s b/asm/overlay_78.s
index 381dc15be..6ee8cb600 100644
--- a/asm/overlay_78.s
+++ b/asm/overlay_78.s
@@ -21,7 +21,7 @@ ov78_021E5900: ; 0x021E5900
 	add r4, r0, #0
 	bl memset
 	add r0, r5, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	add r5, r0, #0
 	ldr r0, [r5]
 	bl Save_GetLeadMonIdxForBugContest
diff --git a/asm/overlay_81.s b/asm/overlay_81.s
index 545496e0a..c90c949db 100644
--- a/asm/overlay_81.s
+++ b/asm/overlay_81.s
@@ -41,7 +41,7 @@ ov81_0223DD60: ; 0x0223DD60
 	str r0, [r4, #0x4c]
 	str r5, [r4]
 	add r0, r5, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	mov r3, #0x6f
 	mov r2, #0xf
 	ldr r1, [r0]
diff --git a/asm/overlay_82.s b/asm/overlay_82.s
index 31f8d25cd..73f3547b0 100644
--- a/asm/overlay_82.s
+++ b/asm/overlay_82.s
@@ -32,7 +32,7 @@ ov82_0223DD60: ; 0x0223DD60
 	str r0, [r5, #0x48]
 	add r0, r4, #0
 	str r4, [r5]
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	add r4, r0, #0
 	add r0, r5, #0
 	ldr r1, [r4]
diff --git a/asm/overlay_83.s b/asm/overlay_83.s
index 20ee4a363..59fb7aee5 100644
--- a/asm/overlay_83.s
+++ b/asm/overlay_83.s
@@ -28,7 +28,7 @@ ov83_0223DD60: ; 0x0223DD60
 	str r0, [r5, #0x4c]
 	add r0, r4, #0
 	str r4, [r5]
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	add r4, r0, #0
 	ldr r1, [r4]
 	ldr r0, _0223DE48 ; =0x0000050C
@@ -9985,7 +9985,7 @@ ov83_02242FE8: ; 0x02242FE8
 	str r0, [r5, #0x4c]
 	add r0, r4, #0
 	str r4, [r5]
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	add r4, r0, #0
 	mov r0, #0xaf
 	ldr r1, [r4]
diff --git a/asm/overlay_84.s b/asm/overlay_84.s
index 2b73823b8..b00bf5638 100644
--- a/asm/overlay_84.s
+++ b/asm/overlay_84.s
@@ -34,7 +34,7 @@ ov84_0223DD60: ; 0x0223DD60
 	str r0, [r1]
 	add r0, r4, #0
 	str r4, [r5]
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	add r4, r0, #0
 	add r0, r5, #0
 	ldr r1, [r4]
diff --git a/asm/overlay_85.s b/asm/overlay_85.s
index 19c5084be..6d4cdfe03 100644
--- a/asm/overlay_85.s
+++ b/asm/overlay_85.s
@@ -8,7 +8,7 @@ ov85_021E5900: ; 0x021E5900
 	push {r4, r5, r6, r7, lr}
 	sub sp, #0xc
 	add r5, r0, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	add r4, r0, #0
 	mov r0, #1
 	add r1, r0, #0
@@ -6453,7 +6453,7 @@ ov85_021E88AC: ; 0x021E88AC
 	sub sp, #0xc
 	add r5, r1, #0
 	add r4, r0, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	add r6, r0, #0
 	ldr r0, [r5]
 	cmp r0, #0
diff --git a/asm/overlay_86.s b/asm/overlay_86.s
index 220b97606..4ac71d299 100644
--- a/asm/overlay_86.s
+++ b/asm/overlay_86.s
@@ -50,7 +50,7 @@ ov86_021E5900: ; 0x021E5900
 	bl BgConfig_Alloc
 	str r0, [r5, #0xc]
 	add r0, r4, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	add r4, r0, #0
 	mov r0, #0x89
 	ldr r1, [r4]
diff --git a/asm/overlay_87.s b/asm/overlay_87.s
index c05a771e7..a32873a69 100644
--- a/asm/overlay_87.s
+++ b/asm/overlay_87.s
@@ -27,7 +27,7 @@ ov87_021E5900: ; 0x021E5900
 	str r0, [r4, #0x58]
 	add r0, r5, #0
 	str r5, [r4]
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	add r5, r0, #0
 	mov r1, #0x5a
 	add r2, r5, #0
diff --git a/asm/overlay_88.s b/asm/overlay_88.s
index 493b559dc..70b501298 100644
--- a/asm/overlay_88.s
+++ b/asm/overlay_88.s
@@ -8,7 +8,7 @@ ov88_02258800: ; 0x02258800
 	push {r4, r5, lr}
 	sub sp, #0xc
 	add r4, r0, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	mov r2, #5
 	add r5, r0, #0
 	mov r0, #3
@@ -102,7 +102,7 @@ ov88_022588C4: ; 0x022588C4
 	bl OverlayManager_GetData
 	add r4, r0, #0
 	add r0, r6, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	add r6, r0, #0
 	ldr r0, [r5]
 	cmp r0, #4
@@ -255,7 +255,7 @@ ov88_022589FC: ; 0x022589FC
 	bl OverlayManager_GetData
 	add r4, r0, #0
 	add r0, r5, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	mov r0, #2
 	lsl r0, r0, #8
 	add r0, r4, r0
diff --git a/asm/overlay_89.s b/asm/overlay_89.s
index ef4959a65..3cb21bc69 100644
--- a/asm/overlay_89.s
+++ b/asm/overlay_89.s
@@ -50,7 +50,7 @@ ov89_02258800: ; 0x02258800
 	add r5, r0, #0
 	bl MI_CpuFill8
 	add r0, r4, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	str r0, [r5]
 	ldr r0, [r0]
 	bl ov45_0222A2C8
diff --git a/asm/overlay_91.s b/asm/overlay_91.s
index 1f04a341d..7c439bf9c 100644
--- a/asm/overlay_91.s
+++ b/asm/overlay_91.s
@@ -7,7 +7,7 @@
 ov91_0225C540: ; 0x0225C540
 	push {r3, r4, r5, lr}
 	add r4, r0, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	add r5, r0, #0
 	mov r0, #3
 	mov r1, #0x6a
@@ -48,7 +48,7 @@ ov91_0225C58C: ; 0x0225C58C
 	bl OverlayManager_GetData
 	add r4, r0, #0
 	add r0, r6, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	add r6, r0, #0
 	add r0, r4, #0
 	add r0, #8
@@ -588,7 +588,7 @@ ov91_0225C9EC: ; 0x0225C9EC
 	bl OverlayManager_GetData
 	add r6, r0, #0
 	add r0, r5, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	ldr r0, [r4]
 	cmp r0, #0
 	beq _0225CA0A
diff --git a/asm/overlay_92.s b/asm/overlay_92.s
index b35ac6748..01c54b566 100644
--- a/asm/overlay_92.s
+++ b/asm/overlay_92.s
@@ -689,7 +689,7 @@ ov92_0225CAB4: ; 0x0225CAB4
 	str r0, [sp, #4]
 	bl memset
 	add r0, r4, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	ldr r1, [sp, #4]
 	ldr r6, [sp, #4]
 	add r1, #0x88
diff --git a/asm/overlay_93_thumb_1.s b/asm/overlay_93_thumb_1.s
index 0fbeb7078..597004b17 100644
--- a/asm/overlay_93_thumb_1.s
+++ b/asm/overlay_93_thumb_1.s
@@ -7,7 +7,7 @@
 ov93_0225C540: ; 0x0225C540
 	push {r3, r4, r5, lr}
 	add r4, r0, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	add r5, r0, #0
 	mov r0, #3
 	mov r1, #0x75
@@ -36,7 +36,7 @@ ov93_0225C574: ; 0x0225C574
 	bl OverlayManager_GetData
 	add r5, r0, #0
 	add r0, r6, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	add r6, r0, #0
 	add r0, r5, #0
 	bl ov93_0225C730
@@ -348,7 +348,7 @@ ov93_0225C768: ; 0x0225C768
 	add r1, #0x98
 	str r0, [r1]
 	add r0, r4, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	str r0, [r5]
 	add r0, r5, #0
 	bl ov93_022626FC
diff --git a/asm/overlay_93_thumb_2.s b/asm/overlay_93_thumb_2.s
index bd5656954..c15fb4ba8 100644
--- a/asm/overlay_93_thumb_2.s
+++ b/asm/overlay_93_thumb_2.s
@@ -5435,7 +5435,7 @@ ov93_02262598: ; 0x02262598
 	add r4, r0, #0
 	bl MI_CpuFill8
 	add r0, r5, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	str r0, [r4]
 	mov r0, #1
 	pop {r3, r4, r5, pc}
diff --git a/asm/overlay_95.s b/asm/overlay_95.s
index df525f96c..bddb325fe 100644
--- a/asm/overlay_95.s
+++ b/asm/overlay_95.s
@@ -2609,7 +2609,7 @@ ov95_021E6D70: ; 0x021E6D70
 	add r4, r0, #0
 	bl memset
 	add r0, r5, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	str r0, [r4]
 	ldr r0, [r0, #0x10]
 	bl Options_GetTextFrameDelay
diff --git a/asm/overlay_96.s b/asm/overlay_96.s
index 83ea87bb2..a052bf824 100644
--- a/asm/overlay_96.s
+++ b/asm/overlay_96.s
@@ -28,7 +28,7 @@ PokeathlonCourseApplication_OvyInit: ; 0x021E5900
 	lsl r0, r0, #2
 	str r1, [r4, r0]
 	add r0, r5, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	mov r2, #0x7e
 	lsl r2, r2, #2
 	add r5, sp, #4
diff --git a/asm/overlay_97.s b/asm/overlay_97.s
index 195df06e6..942e2b22d 100644
--- a/asm/overlay_97.s
+++ b/asm/overlay_97.s
@@ -103,7 +103,7 @@ _0221E66E:
 	cmp r0, #0
 	beq _0221E68A
 	add r0, r5, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	add r1, r0, #0
 	add r0, r4, #0
 	bl ov97_0221E98C
@@ -150,7 +150,7 @@ ov97_0221E69C: ; 0x0221E69C
 ov97_0221E6DC: ; 0x0221E6DC
 	push {r3, r4, r5, lr}
 	add r5, r0, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	add r4, r0, #0
 _0221E6E6:
 	add r0, r5, #0
@@ -173,7 +173,7 @@ ov97_0221E700: ; 0x0221E700
 	push {r4, r5, r6, r7, lr}
 	sub sp, #0x24
 	add r4, r0, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	add r7, r0, #0
 	add r0, r4, #0
 	mov r1, #0x34
diff --git a/asm/overlay_99.s b/asm/overlay_99.s
index 3d4de7683..080eade88 100644
--- a/asm/overlay_99.s
+++ b/asm/overlay_99.s
@@ -12,7 +12,7 @@ ov99_021E5900: ; 0x021E5900
 	mov r1, #2
 	bl HandleLoadOverlay
 	add r0, r4, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	add r5, r0, #0
 	bne _021E591C
 	bl GF_AssertFail
@@ -1829,7 +1829,7 @@ ov99_021E677C: ; 0x021E677C
 	mov r1, #2
 	bl HandleLoadOverlay
 	add r0, r4, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	add r5, r0, #0
 	bne _021E6798
 	bl GF_AssertFail
@@ -3993,7 +3993,7 @@ ov99_021E7818: ; 0x021E7818
 	mov r1, #2
 	bl HandleLoadOverlay
 	add r0, r4, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	add r5, r0, #0
 	bl GX_DisableEngineBLayers
 	bl GX_DisableEngineALayers
@@ -5363,7 +5363,7 @@ ov99_021E8304: ; 0x021E8304
 	mov r1, #2
 	bl HandleLoadOverlay
 	add r0, r4, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	add r5, r0, #0
 	bne _021E831E
 	bl GF_AssertFail
diff --git a/asm/overlay_trainer_card_main.s b/asm/overlay_trainer_card_main.s
index 59dfde778..487e2c2ae 100644
--- a/asm/overlay_trainer_card_main.s
+++ b/asm/overlay_trainer_card_main.s
@@ -1,3 +1,4 @@
+#include "constants/sndseq.h"
 	.include "asm/macros.inc"
 	.include "global.inc"
 
@@ -53,7 +54,7 @@ TrainerCardMainApp_OvyInit: ; 0x021E5AC0
 	add r4, r0, #0
 	bl memset
 	add r0, r5, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	add r1, r4, #0
 	add r1, #0xe4
 	str r0, [r1]
@@ -203,7 +204,7 @@ _021E5C2C:
 	ldr r0, _021E5D6C ; =0x000033A0
 	add r0, r4, r0
 	bl ov51_021E7DA4
-	ldr r0, _021E5D70 ; =0x00000694
+	ldr r0, _021E5D70 ; =SEQ_SE_DP_CARD3
 	bl PlaySE
 	ldr r0, _021E5D74 ; =0x0000311C
 	add r0, r4, r0
@@ -308,7 +309,7 @@ _021E5D60: .word 0x0000343A
 _021E5D64: .word 0x00000678
 _021E5D68: .word 0x00003424
 _021E5D6C: .word 0x000033A0
-_021E5D70: .word 0x00000694
+_021E5D70: .word SEQ_SE_DP_CARD3
 _021E5D74: .word 0x0000311C
 _021E5D78: .word 0x000033CC
 _021E5D7C: .word 0x00000674
@@ -1671,7 +1672,7 @@ _021E68B0:
 	ldr r2, [r4, r0]
 	add r2, #0x80
 	str r2, [r4, r0]
-	ldr r0, _021E69DC ; =0x00000695
+	ldr r0, _021E69DC ; =SEQ_SE_DP_CARD5
 	bl PlaySE
 	ldr r0, _021E69D4 ; =0x00003436
 	ldrb r1, [r4, r0]
@@ -1807,7 +1808,7 @@ _021E69C4:
 	nop
 _021E69D4: .word 0x00003436
 _021E69D8: .word 0x000030FC
-_021E69DC: .word 0x00000695
+_021E69DC: .word SEQ_SE_DP_CARD5
 _021E69E0: .word 0x00003394
 _021E69E4: .word 0x000030F4
 _021E69E8: .word 0x0000343A
@@ -1878,7 +1879,7 @@ ov51_021E6A54: ; 0x021E6A54
 	lsl r0, r0, #0x1e
 	lsr r0, r0, #0x1f
 	bne _021E6A8E
-	ldr r0, _021E6AA8 ; =0x000005DC
+	ldr r0, _021E6AA8 ; =SEQ_SE_DP_SELECT
 	bl PlaySE
 	mov r0, #4
 	pop {r3, pc}
@@ -1886,7 +1887,7 @@ _021E6A7C:
 	mov r0, #2
 	tst r0, r1
 	beq _021E6A8E
-	mov r0, #0x25
+	mov r0, #SEQ_SE_GS_GEARCANCEL>>6
 	lsl r0, r0, #6
 	bl PlaySE
 	mov r0, #5
@@ -1904,7 +1905,7 @@ _021E6A98:
 _021E6A9C: .word gSystem
 _021E6AA0: .word 0x000030F4
 _021E6AA4: .word 0x0000343A
-_021E6AA8: .word 0x000005DC
+_021E6AA8: .word SEQ_SE_DP_SELECT
 	thumb_func_end ov51_021E6A54
 
 	thumb_func_start ov51_021E6AAC
@@ -1924,7 +1925,7 @@ _021E6ABE:
 	beq _021E6AD8
 	mov r0, #1
 	str r0, [r4]
-	mov r0, #0x25
+	mov r0, #SEQ_SE_GS_GEARCANCEL>>6
 	lsl r0, r0, #6
 	bl PlaySE
 	mov r0, #5
@@ -1945,7 +1946,7 @@ _021E6AD8:
 	beq _021E6B02
 	mov r0, #1
 	str r0, [r4]
-	ldr r0, _021E6B38 ; =0x000005DC
+	ldr r0, _021E6B38 ; =SEQ_SE_DP_SELECT
 	bl PlaySE
 	mov r0, #4
 	pop {r3, r4, r5, pc}
@@ -1974,7 +1975,7 @@ _021E6B28: .word _021E7DB8
 _021E6B2C: .word 0x000030F4
 _021E6B30: .word 0x0000343A
 _021E6B34: .word ov51_021E7DBC
-_021E6B38: .word 0x000005DC
+_021E6B38: .word SEQ_SE_DP_SELECT
 _021E6B3C: .word ov51_021E7DC0
 _021E6B40: .word gSystem + 0x40
 	thumb_func_end ov51_021E6AAC
diff --git a/asm/overlay_trainer_card_signature.s b/asm/overlay_trainer_card_signature.s
index 819bc2e49..2a0ed2c82 100644
--- a/asm/overlay_trainer_card_signature.s
+++ b/asm/overlay_trainer_card_signature.s
@@ -90,17 +90,17 @@ _021E80D6:
 	add r3, r0, #0
 	bl sub_0200FA24
 	add r0, r6, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	bl Save_TranerCard_get
 	bl TrainerCard_GetSignature
 	ldr r1, _021E8238 ; =0x00005B98
 	str r0, [r4, r1]
 	add r0, r6, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	bl Sav2_GameStats_get
 	str r0, [r4, #8]
 	add r0, r6, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	bl Sav2_PlayerData_GetOptionsAddr
 	str r0, [r4, #0xc]
 	add r0, r4, #0
diff --git a/asm/unk_02019014.s b/asm/unk_02019014.s
index dc69dcd52..ecdbc1661 100644
--- a/asm/unk_02019014.s
+++ b/asm/unk_02019014.s
@@ -434,7 +434,7 @@ sub_020192D0: ; 0x020192D0
 	add r5, r0, #0
 	bl MI_CpuFill8
 	add r0, r4, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	str r0, [r5]
 	ldr r1, _02019358 ; =0x0000047D
 	mov r0, #0xb
diff --git a/asm/unk_0203DE74.s b/asm/unk_0203DE74.s
index cea775a12..5723104bf 100644
--- a/asm/unk_0203DE74.s
+++ b/asm/unk_0203DE74.s
@@ -21,7 +21,7 @@ _021D4158:
 sub_0203DE74: ; 0x0203DE74
 	push {r3, r4, r5, lr}
 	add r5, r0, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	add r4, r0, #0
 	add r0, r5, #0
 	bl sub_0203DFE0
diff --git a/asm/unk_020658D4.s b/asm/unk_020658D4.s
index fb31eaa35..e45e64a28 100644
--- a/asm/unk_020658D4.s
+++ b/asm/unk_020658D4.s
@@ -190,7 +190,7 @@ sub_020659CC: ; 0x020659CC
 	add r0, r4, #0
 	add r0, #0xec ; ->followMon.unk8
 	str r1, [r0]
-	add r4, #0xf0 ; ->followMon.unkC
+	add r4, #0xf0 ; ->followMon.parentData
 	add r0, r5, #0
 	str r1, [r4]
 	bl MapObject_GetCurrentX
diff --git a/asm/unk_02078E30.s b/asm/unk_02078E30.s
index e4812ba02..6ac4c1280 100644
--- a/asm/unk_02078E30.s
+++ b/asm/unk_02078E30.s
@@ -1703,7 +1703,7 @@ sub_02079BD8: ; 0x02079BD8
 	add r4, r0, #0
 	bl memset
 	add r0, r5, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	ldr r1, _02079CC8 ; =0x00000654
 	str r0, [r4, r1]
 	mov r0, #0xc
diff --git a/asm/unk_02082908.s b/asm/unk_02082908.s
index 71fd03fe9..126994da2 100644
--- a/asm/unk_02082908.s
+++ b/asm/unk_02082908.s
@@ -108,7 +108,7 @@ _0208291E:
 	ldr r0, [r4, r0]
 	bl sub_020831A4
 	add r0, r6, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	add r1, r0, #0
 	add r0, r4, #0
 	bl sub_02083160
@@ -743,7 +743,7 @@ sub_02082EE8: ; 0x02082EE8
 	bl OverlayManager_GetData
 	add r4, r0, #0
 	ldr r0, [sp, #0x10]
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	add r5, r0, #0
 	mov r0, #0x56
 	lsl r0, r0, #2
@@ -1253,7 +1253,7 @@ sub_02083334: ; 0x02083334
 	sub sp, #0x10
 	add r4, r0, #0
 	add r0, r1, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	add r7, r0, #0
 	ldr r0, _020834E4 ; =0x0000045C
 	mov r1, #4
@@ -1468,7 +1468,7 @@ sub_020834FC: ; 0x020834FC
 	sub sp, #0x14
 	add r5, r0, #0
 	add r0, r1, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	add r4, r0, #0
 	ldr r0, [r4, #0x44]
 	cmp r0, #0
@@ -2993,7 +2993,7 @@ _02084122:
 	add r0, r5, r0
 	bl sub_02083F18
 	add r0, r6, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	mov r1, #0x46
 	lsl r1, r1, #2
 	ldrh r2, [r5, r1]
diff --git a/asm/unk_020850F4.s b/asm/unk_020850F4.s
index 0ce10d347..756c6450e 100644
--- a/asm/unk_020850F4.s
+++ b/asm/unk_020850F4.s
@@ -32,7 +32,7 @@ sub_020850F4: ; 0x020850F4
 	add r4, r0, #0
 	bl memset
 	add r0, r5, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	add r5, r0, #0
 	mov r0, #0xee
 	lsl r0, r0, #2
diff --git a/asm/unk_02087A78.s b/asm/unk_02087A78.s
index 647fc0c4a..b68965e67 100644
--- a/asm/unk_02087A78.s
+++ b/asm/unk_02087A78.s
@@ -17,7 +17,7 @@
 	thumb_func_start sub_02087A78
 sub_02087A78: ; 0x02087A78
 	push {r3, lr}
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	ldr r0, [r0, #0x14]
 	pop {r3, pc}
 	.balign 4, 0
@@ -50,7 +50,7 @@ sub_02087A8C: ; 0x02087A8C
 	add r4, r0, #0
 	bl MI_CpuFill8
 	add r0, r5, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	str r0, [r4, #0x28]
 	ldr r0, [r0, #0xc]
 	ldr r1, _02087B00 ; =0x00004170
diff --git a/asm/unk_02088288.s b/asm/unk_02088288.s
index 1e797143b..e6c35f0fa 100644
--- a/asm/unk_02088288.s
+++ b/asm/unk_02088288.s
@@ -83,7 +83,7 @@ sub_02088298: ; 0x02088298
 	add r4, r0, #0
 	bl memset
 	add r0, r6, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	mov r1, #0x8b
 	lsl r1, r1, #2
 	str r0, [r4, r1]
diff --git a/asm/unk_020915B0.s b/asm/unk_020915B0.s
index 2aeae9f54..284b3cc32 100644
--- a/asm/unk_020915B0.s
+++ b/asm/unk_020915B0.s
@@ -97,7 +97,7 @@ sub_02091634: ; 0x02091634
 	lsl r2, r2, #0xc
 	bl CreateHeap
 	add r0, r4, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	ldr r0, [r0, #8]
 	mov r1, #0x30
 	bl sub_020915F0
diff --git a/asm/unk_02091CDC.s b/asm/unk_02091CDC.s
index ad3d17376..8634ec903 100644
--- a/asm/unk_02091CDC.s
+++ b/asm/unk_02091CDC.s
@@ -30,7 +30,7 @@ App_DeleteSave_Init: ; 0x02091CDC
 	mov r0, #0
 	str r0, [r4, #4]
 	add r0, r5, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	ldr r0, [r0, #8]
 	str r0, [r4, #0x30]
 	mov r0, #1
diff --git a/asm/unk_020921A4.s b/asm/unk_020921A4.s
index 1ae6f454d..e04347909 100644
--- a/asm/unk_020921A4.s
+++ b/asm/unk_020921A4.s
@@ -30,7 +30,7 @@ sub_020921A4: ; 0x020921A4
 	mov r0, #0
 	str r0, [r4, #4]
 	add r0, r5, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	ldr r0, [r0, #8]
 	str r0, [r4, #0x34]
 	mov r0, #1
diff --git a/asm/unk_020965A4.s b/asm/unk_020965A4.s
index c5abf3e19..eae7a15c9 100644
--- a/asm/unk_020965A4.s
+++ b/asm/unk_020965A4.s
@@ -26,7 +26,7 @@ sub_020965A4: ; 0x020965A4
 	add r0, r4, #0
 	bl sub_02096884
 	add r0, r5, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	str r0, [r4]
 	cmp r0, #0
 	bne _020965DC
diff --git a/asm/unk_02097B78.s b/asm/unk_02097B78.s
index e7a4a9739..d5dfe8df5 100644
--- a/asm/unk_02097B78.s
+++ b/asm/unk_02097B78.s
@@ -26,7 +26,7 @@ sub_02097B78: ; 0x02097B78
 	add r4, r0, #0
 	bl MI_CpuFill8
 	add r0, r5, #0
-	bl OverlayManager_GetField18
+	bl OverlayManager_GetParentWork
 	str r0, [r4]
 	mov r0, #1
 	pop {r3, r4, r5, pc}
diff --git a/global.inc b/global.inc
index 4f5295c9d..4bec1d950 100644
--- a/global.inc
+++ b/global.inc
@@ -1284,7 +1284,7 @@
 .public OverlayManager_CreateAndGetData
 .public OverlayManager_FreeData
 .public OverlayManager_GetData
-.public OverlayManager_GetField18
+.public OverlayManager_GetParentWork
 .public OverlayManager_delete
 .public OverlayManager_new
 .public OverlayManager_run
diff --git a/include/overlay_manager.h b/include/overlay_manager.h
index 38b6c20b2..23f64a2c1 100644
--- a/include/overlay_manager.h
+++ b/include/overlay_manager.h
@@ -21,18 +21,18 @@ struct OVY_MANAGER {
     OVY_MGR_TEMPLATE template;
     int exec_state;
     int proc_state;
-    void *unk_18;
+    void *parentWork;
     void *data;
     u32 unk_20;
     u32 unk_24;
 };
 
-OVY_MANAGER *OverlayManager_new(const OVY_MGR_TEMPLATE *template, void *a1, HeapID heapId);
+OVY_MANAGER *OverlayManager_new(const OVY_MGR_TEMPLATE *template, void *parentWork, HeapID heapId);
 void OverlayManager_delete(OVY_MANAGER *man);
 void *OverlayManager_CreateAndGetData(OVY_MANAGER *man, u32 size, HeapID heapId);
 void *OverlayManager_GetData(OVY_MANAGER *man);
 void OverlayManager_FreeData(OVY_MANAGER *man);
-void *OverlayManager_GetField18(OVY_MANAGER *man);
+void *OverlayManager_GetParentWork(OVY_MANAGER *man);
 BOOL OverlayManager_run(OVY_MANAGER *man);
 
 #endif //POKEHEARTGOLD_OVERLAY_MANAGER_H
diff --git a/include/overlay_trainer_card.h b/include/overlay_trainer_card.h
index 7190a3bad..72bed8ad0 100644
--- a/include/overlay_trainer_card.h
+++ b/include/overlay_trainer_card.h
@@ -8,9 +8,9 @@
 typedef struct {
     u8 unk0[4];
     u8 unk4a:4;
-    u8 unk4b:1;
+    u8 signatureExists:1;
     u8 unk5[0x63];
-    u8 unk68[0x600];
+    u8 signature[0x600];
     u8 unk668[6];
     SAVEDATA *saveData;
     u32 reqUpdateSignature;
@@ -20,7 +20,7 @@ typedef struct {
     HeapID heap_id;
     u8 unk4[4];
     OVY_MANAGER *ov_mgr;
-    Ov50_021E5A3C *unkC;
+    Ov50_021E5A3C *parentData;
     void *unk10;
 } TrainerCardAppState;
 
diff --git a/src/overlay_manager.c b/src/overlay_manager.c
index 964ee7538..3b4a1bc97 100644
--- a/src/overlay_manager.c
+++ b/src/overlay_manager.c
@@ -1,13 +1,13 @@
 #include "overlay_manager.h"
 
-OVY_MANAGER *OverlayManager_new(const OVY_MGR_TEMPLATE *template, void *a1, HeapID heapId) {
+OVY_MANAGER *OverlayManager_new(const OVY_MGR_TEMPLATE *template, void *parentWork, HeapID heapId) {
     OVY_MANAGER *ret;
 
     ret = AllocFromHeap(heapId, sizeof(OVY_MANAGER));
     ret->template = *template;
     ret->exec_state = 0;
     ret->proc_state = 0;
-    ret->unk_18 = a1;
+    ret->parentWork = parentWork;
     ret->data = NULL;
     ret->unk_20 = 0;
     ret->unk_24 = 0;
@@ -35,8 +35,8 @@ void OverlayManager_FreeData(OVY_MANAGER *man) {
     man->data = NULL;
 }
 
-void *OverlayManager_GetField18(OVY_MANAGER *man) {
-    return man->unk_18;
+void *OverlayManager_GetParentWork(OVY_MANAGER *man) {
+    return man->parentWork;
 }
 
 BOOL OverlayManager_run(OVY_MANAGER *man) {
diff --git a/src/overlay_trainer_card.c b/src/overlay_trainer_card.c
index 3dd5dcfd9..7c14d89b6 100644
--- a/src/overlay_trainer_card.c
+++ b/src/overlay_trainer_card.c
@@ -17,10 +17,10 @@ enum {
 };
 
 static BOOL isSubprocFinished(OVY_MANAGER **man);
-static int TCardAppRunStep_Init(TrainerCardAppState *a0);
-static int TCardAppRunStep_Exec(TrainerCardAppState *a0);
-static int TCardAppRunStep_SignatureInit(TrainerCardAppState *a0);
-static int TCardAppRunStep_SignatureExec(TrainerCardAppState *a0);
+static int TCardAppRunStep_Init(TrainerCardAppState *work);
+static int TCardAppRunStep_Exec(TrainerCardAppState *work);
+static int TCardAppRunStep_SignatureInit(TrainerCardAppState *work);
+static int TCardAppRunStep_SignatureExec(TrainerCardAppState *work);
 
 static BOOL isSubprocFinished(OVY_MANAGER **man) {
     if (*man && OverlayManager_run(*man)) {
@@ -32,14 +32,14 @@ static BOOL isSubprocFinished(OVY_MANAGER **man) {
 }
 
 BOOL TrainerCardApp_OvyInit(OVY_MANAGER *man, int *state) {
-    void *ptr = OverlayManager_GetField18(man);
+    void *ptr = OverlayManager_GetParentWork(man);
     CreateHeap(3, HEAP_ID_TRAINER_CARD, 0x1000);
 
     TrainerCardAppState *data = OverlayManager_CreateAndGetData(man, sizeof(TrainerCardAppState), HEAP_ID_TRAINER_CARD);
     MI_CpuFill8(data, 0, sizeof(TrainerCardAppState));
 
     data->heap_id = HEAP_ID_TRAINER_CARD;
-    data->unkC = ptr;
+    data->parentData = ptr;
     data->unk10 = ptr;
     return TRUE;
 }
@@ -75,7 +75,7 @@ BOOL TrainerCardApp_OvyExit(OVY_MANAGER *man, int *state) {
     return TRUE;
 }
 
-static int TCardAppRunStep_Init(TrainerCardAppState *a0) {
+static int TCardAppRunStep_Init(TrainerCardAppState *work) {
     static const OVY_MGR_TEMPLATE template = {
         TrainerCardMainApp_OvyInit,
         TrainerCardMainApp_OvyExec,
@@ -83,39 +83,39 @@ static int TCardAppRunStep_Init(TrainerCardAppState *a0) {
         FS_OVERLAY_ID(OVY_51) 
     };
 
-    a0->ov_mgr = OverlayManager_new(&template, a0->unkC, a0->heap_id);
+    work->ov_mgr = OverlayManager_new(&template, work->parentData, work->heap_id);
     return TRAINERCARD_RUN_EXEC;
 }
 
-static int TCardAppRunStep_Exec(TrainerCardAppState *a0) {
-    if (!isSubprocFinished(&a0->ov_mgr)) {
+static int TCardAppRunStep_Exec(TrainerCardAppState *work) {
+    if (!isSubprocFinished(&work->ov_mgr)) {
         return TRAINERCARD_RUN_EXEC;
-    } else if (a0->unkC->reqUpdateSignature != 0) {
+    } else if (work->parentData->reqUpdateSignature != 0) {
         return TRAINERCARD_RUN_SIGNATURE_INIT;
     } else {
         return TRAINERCARD_RUN_EXIT;
     }
 }
 
-static int TCardAppRunStep_SignatureInit(TrainerCardAppState *a0) {
+static int TCardAppRunStep_SignatureInit(TrainerCardAppState *work) {
     const OVY_MGR_TEMPLATE template = {
         SignBackOfTrainerCardApp_OvyInit, 
         SignBackOfTrainerCardApp_OvyExec, 
         SignBackOfTrainerCardApp_OvyExit,
         FS_OVERLAY_ID(OVY_52) 
     };
-    a0->ov_mgr = OverlayManager_new(&template, a0->unkC->saveData, a0->heap_id);
+    work->ov_mgr = OverlayManager_new(&template, work->parentData->saveData, work->heap_id);
     return TRAINERCARD_RUN_SIGNATURE_EXEC;
 }
 
-static int TCardAppRunStep_SignatureExec(TrainerCardAppState *a0) {
-    void *ptr;
-    if (!isSubprocFinished(&a0->ov_mgr)) {
+static int TCardAppRunStep_SignatureExec(TrainerCardAppState *work) {
+    struct SaveTrainerCard *ptr;
+    if (!isSubprocFinished(&work->ov_mgr)) {
         return TRAINERCARD_RUN_SIGNATURE_EXEC;
     }
 
-    ptr = Save_TranerCard_get(a0->unkC->saveData);
-    a0->unkC->unk4b = TrainerCard_SignatureExists(ptr);
-    MI_CpuCopy8(TrainerCard_GetSignature(ptr), a0->unkC->unk68, sizeof(a0->unkC->unk68));
+    ptr = Save_TranerCard_get(work->parentData->saveData);
+    work->parentData->signatureExists = TrainerCard_SignatureExists(ptr);
+    MI_CpuCopy8(TrainerCard_GetSignature(ptr), work->parentData->signature, sizeof(work->parentData->signature));
     return TRAINERCARD_RUN_INIT;
 }