在很多的報表開發中，需要用到VBA去設定Excel的一些規則。 

以下是一個根據下拉框單元格的值來給特定單元格進行賦值的程式碼：

Private Sub Worksheet_SelectionChange(ByVal Target As Range)
    On Error Resume Next:
    Application.ScreenUpdating = False
    If Target.Column = 7 Then        // 這是需要賦值的DDL列
        If Target.Offset(0, -2).Value = 13 Then  //表示賦值列往前移動兩個單位的格子值
            
 
With Selection.Validation
            .Delete
            .Add Type:=xlValidateList, AlertStyle:=xlValidAlertStop, Operator:= _
             xlBetween, Formula1:="No"   //賦值為No
            .IgnoreBlank = True
            .InCellDropdown = True
            .InputTitle = ""
            .ErrorTitle = ""
            .InputMessage 
 
= ""
            .ErrorMessage = ""
            .IMEMode = xlIMEModeNoControl
            .ShowInput = True
            .ShowError = True
            End With
        ElseIf Target.Offset(0, -2).Value <> 13 Then
            With Selection.Validation
            .Delete
            .Add Type:=xlValidateList, AlertStyle:=xlValidAlertStop, Operator:= _
             xlBetween, Formula1:
 
="=Exp"  //這裡的Exp為自定義名字的列作為資料來源（Formulas -〉Name managers ) 
            .IgnoreBlank = True
            .InCellDropdown = True
            .InputTitle = ""
            .ErrorTitle = ""
            .InputMessage = ""
            .ErrorMessage = ""
            .IMEMode = xlIMEModeNoControl
           .ShowInput = True
            .ShowError = True
            End With
        End If
    ElseIf Target.Column = 8 Then   //下面的邏輯用來控制，當第7列值為No時，會把第8，9，10，11列保護起來不能輸入
        If Target.Offset(0, -1).Value = "No" Then
            Target.Locked = True
            Target.Offset(1, -6).Select
        End If
    ElseIf Target.Column = 9 Then
        If Target.Offset(0, -2).Value = "No" Then
            Target.Locked = True
            Target.Offset(1, -7).Select
        End If
    ElseIf Target.Column = 10 Then
        If Target.Offset(0, -3).Value = "No" Then
            Target.Locked = True
            Target.Offset(1, -8).Select
        End If
    ElseIf Target.Column = 11 Then
        If Target.Offset(0, -4).Value = "No" Then
            Target.Locked = True
            Target.Offset(1, -9).Select
        End If
    End If
    Application.ScreenUpdating = True
     
End Sub