Private Sub Worksheet_SelectionChange(ByVal Target As Range)
If Target.Count > 1 Then Exit Sub
If Not Intersect(Target, [B3:M12]) Is Nothing Then
L = Target.Row: C = Target.Column
If Target = "-" Then Cells(L, C + 1) = Cells(L, C + 1) - 1
If Target = "+" Then Cells(L, C - 1) = Cells(L, C - 1) + 1
Cells(L, "A").Select
End If
End Sub