删除以excel

Question

我有一个元数据表，我正在设置一些参数，我从中生成支点。我通过下拉列表选择这些参数。

Here is what my metadata sheet looks like.

我在相应的单元格中以逗号分隔的方式保存下拉列表的值。为此，我在该表上有一个宏：

 Private Sub Worksheet_Change(ByVal Target As Range)

'Set automatic formula calculation ON
Application.Calculation = xlAutomatic

Dim Oldvalue As String
Dim Newvalue As String
Application.EnableEvents = True
On Error GoTo Exitsub
If Target.Address = "$C$5" Or Target.Address = "$C$6" Or Target.Address = "$C$7" Or Target.Address = "$D$5" Or Target.Address = "$D$6" Or Target.Address = "$D$7" Or Target.Address = "$E$5" Or Target.Address = "$E$6" Or Target.Address = "$E$7" Then
  If Target.SpecialCells(xlCellTypeAllValidation) Is Nothing Then
    GoTo Exitsub
  Else: If Target.Value = "" Then GoTo Exitsub Else
    Application.EnableEvents = False
    Newvalue = Target.Value
    Application.Undo
    Oldvalue = Target.Value
      If Oldvalue = "" Then
        Target.Value = Newvalue
      Else
        If InStr(1, Oldvalue, Newvalue) = 0 Then
            Target.Value = Oldvalue & "," & Newvalue
      Else:
        Target.Value = Oldvalue
      End If
    End If
  End If
End If
Application.EnableEvents = True
Exitsub:
Application.EnableEvents = True
End Sub

我的问题：

1）有没有一种定义范围的方法，而不是在宏的第10行定义单个单元格？基本上我使用＆＃34;或＆＃34;

将C5：E7范围内的所有单元格定义为单个单元格

2）我无法删除单个逗号分隔值，因为这样做会给我以下错误。A user has restricted values that can be entered into the cell 我需要整个单元格，然后再次选择值。有没有办法可以只删除单个值？