Maybe I'm a newb, but after lots of head scratching I came up with this...
Private Sub Worksheet_Change(ByVal Target As Range)
If Intersect(Target, Range("A1")) Is Nothing And Intersect(Target, Range("A4")) Is Nothing And Intersect(Target, Range("A7")) Is Nothing And Intersect(Target, Range("A10")) Is Nothing And Intersect(Target, Range("A13")) Is Nothing Then
Exit Sub
Else
Dim i As Integer
i = 1
While i <= 13
If Cells(i, 1) <> Cells(i, 10) Then Cells(i, 1) = Cells(i, 10)
i = i + 3
Wend
End If
End Sub
Just copy and paste this under "Microsoft Excel Projects" -> "Sheet1 (Sheet1)" and it should work exactly how you described it.
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