I have list boxes in several columns in my worksheet. I want users to be
allowed to pick multiple choices from the list boxes in columns 6, 20 & 21.
The code below is allowing users to pick multiple choices from ALL the list
boxes. Can I modify this code to only allow it in columns 6, 20 & 21?
Thanks.

Private Sub Worksheet_Change(ByVal Target As Range)
Dim rngDV As Range
Dim oldVal As String
Dim newVal As String
If Target.Count 1 Then GoTo exitHandler

On Error Resume Next
Set rngDV = Cells.SpecialCells(xlCellTypeAllValidation)
On Error GoTo exitHandler

If rngDV Is Nothing Then GoTo exitHandler

If Intersect(Target, rngDV) Is Nothing Then
'do nothing
Else
Application.EnableEvents = False
newVal = Target.Value
Application.Undo
oldVal = Target.Value
Target.Value = newVal
If Target.Column = 6 Or 21 Or 22 Then
If oldVal = "" Then
'do nothing
Else
If newVal = "" Then
'do nothing
Else
Target.Value = oldVal _
& ";# " & newVal
End If
End If
End If
End If

exitHandler:
Application.EnableEvents = True


End Sub