Private Sub Worksheet_Change(ByVal Target As Range)
Application.EnableEvents = False
If Target.Address = "$B$1" Then [C1] = [A1] + [B1]
If Target.Address = "$C$1" Then [B1] = [C1] - [A1]
Application.EnableEvents = True
End Sub
Private Sub Worksheet_Change(ByVal Target As Range)
Application.EnableEvents = False
If Target.Address = "$B$1" Then [C1] = [A1] + [B1]
If Target.Address = "$C$1" Then [B1] = [C1] - [A1]
Application.EnableEvents = True
End Sub