diff --git a/vba_code_kotsu_master.txt b/vba_code_kotsu_master.txt
index 452f5dc..dc047f8 100644
--- a/vba_code_kotsu_master.txt
+++ b/vba_code_kotsu_master.txt
@@ -1,10 +1,10 @@
-Sub ClearRowData(ByVal ws As Worksheet, ByVal rowNum As Long)
+Sub Z1_ClearRowData(ByVal ws As Worksheet, ByVal rowNum As Long)
     ' Clear from D column onwards
     ws.Range(ws.Cells(rowNum, 4), ws.Cells(rowNum, 15)).ClearContents
     ws.Cells(rowNum, 2).ClearContents ' Q column error info
 End Sub
 
-Sub ImportMasterDetailData()
+Sub Z1_ImportMasterDetailData()
     Dim filePath As String
     Dim fileDialog As FileDialog
     Dim wsTarget As Worksheet
@@ -119,7 +119,7 @@ NextLine:
     MsgBox writeRow - 7 & " rows imported.", vbInformation
 End Sub
 
-Function CleanCSVField(ByVal field As Variant) As String
+Function Z1_CleanCSVField(ByVal field As Variant) As String
     If IsEmpty(field) Or IsNull(field) Then
         CleanCSVField = ""
         Exit Function
@@ -137,7 +137,7 @@ Function CleanCSVField(ByVal field As Variant) As String
     CleanCSVField = result
 End Function
 
-Sub validateDetailData(ByVal ws As Worksheet, ByVal rowNum As Long)
+Sub Z1_validateDetailData(ByVal ws As Worksheet, ByVal rowNum As Long)
     ' Check C column - must be 3-digit alphanumeric, required
     Dim cValue As String
     cValue = Trim(ws.Cells(rowNum, 3).Value)
@@ -234,7 +234,7 @@ End Sub
 
 
 ' Button macro (Validate selected row)
-Sub validateDetailDataButton()
+Sub Z1_validateDetailDataButton()
     Dim ws As Worksheet
     Dim lastRow As Long
     Dim r As Long
@@ -259,7 +259,7 @@ Sub validateDetailDataButton()
     MsgBox "Validation complete. Errors: " & errorCount & ", ", vbInformation
 End Sub
 
-Sub ExportMasterDetailData()
+Sub Z1_ExportMasterDetailData()
     Dim ws As Worksheet
     Set ws = ActiveSheet