VBA – Change Conditional Compilation Arguments in Access
VBA is not a scripting language. It compiles. As such, it has compilation arguments, which can be changed through code or manually. In MS Access you may find these here:
VBEditor>Tools>VBA Project>Database Properties:

If you want to use them for some debugging, this is the way to change them through code:
Application.SetOption "Conditional Compilation Arguments","A=4:B=10"
And this is how you get them:
Application.GetOption("Conditional Compilation Arguments")
Once you use them, you can refer to them like this for debugging reasons:
Sub TestMe()
#If A = 1 Then
Debug.Print "a is 1"
#Else
Debug.Print "a is not 1"
#End If
End Sub
Cheers!