By: Tanjima Hossain

In reply to Julie.

Hello Julie,
You can try out the following code. I think it will work for you. Just make sure to change the number in Target.Column = 3 according to your column number of data validation.

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
Else
Application.EnableEvents = False
newVal = Target.Value
Application.Undo
oldVal = Target.Value
Target.Value = newVal
If Target.Column = 3 Then
If oldVal = "" Then
Else
If newVal = "" Then
Else
Target.Value = oldVal & ", " & newVal

End If
End If
End If
End If

exitHandler:
Application.EnableEvents = True
End Sub