diff --git a/.github/workflows/branches.yml b/.github/workflows/aboveS20.yml
similarity index 76%
rename from .github/workflows/branches.yml
rename to .github/workflows/aboveS20.yml
index 1232a16..f539085 100644
--- a/.github/workflows/branches.yml
+++ b/.github/workflows/aboveS20.yml
@@ -1,4 +1,4 @@
-name: Update belowS20 and aboveS20 Branches
+name: Update aboveS20 Branches
 
 on:
   push:
@@ -8,7 +8,7 @@ on:
 permissions:
   contents: write
 
-jobs:
+jobs:          
   update-branches:
     runs-on: ubuntu-latest
     steps:
@@ -22,16 +22,9 @@ jobs:
 
       - name: Delete branches locally and on remote
         run: |
-          git push origin --delete belowS20 || true
           git push origin --delete aboveS20 || true
-          git branch -D belowS20 || true
           git branch -D aboveS20 || true
 
-      - name: Create belowS20 branch from master
-        run: |
-          git checkout -b belowS20
-          git push origin belowS20
-
       - name: Create aboveS20 branch from master and modify inc.h
         run: |
           git checkout master
@@ -40,3 +33,15 @@ jobs:
           git add "./Project Reboot 3.0/inc.h"
           git commit -m "Add #define ABOVE_S20 to inc.h in aboveS20 branch"
           git push origin aboveS20
+
+  build-master:
+    uses: ./.github/workflows/msbuild.yml
+    needs: update-branches
+    with:
+      branch: master
+
+  build-aboveS20:
+    uses: ./.github/workflows/msbuild.yml
+    needs: update-branches
+    with:
+      branch: aboveS20
diff --git a/.github/workflows/msbuild.yml b/.github/workflows/msbuild.yml
index c9411eb..def27c9 100644
--- a/.github/workflows/msbuild.yml
+++ b/.github/workflows/msbuild.yml
@@ -1,10 +1,11 @@
 name: MSBuild
 
 on:
-  push:
-    branches: [ "aboveS20", "belowS20" ]
-  pull_request:
-    branches: [ "aboveS20", "belowS20" ]
+  workflow_call:
+    inputs:
+      branch:
+        required: true
+        type: string
 
 env:
   # Path to the solution file relative to the root of the project.
@@ -24,6 +25,8 @@ jobs:
 
     steps:
     - uses: actions/checkout@v3
+      with:
+        ref: ${{ inputs.branch }}
 
     - name: Add MSBuild to PATH
       uses: microsoft/setup-msbuild@v1.0.2