Apply VBA Excel Codes to multiple columns for multi-selection drop down menus

[omargonz]

I have successfully used a code to create the multi-selection drop down menus across an entire column but I was wondering there was a way to apply it to multiple columns on the same sheet. I currently have it for E(5) but want to apply it to F(6). I don't have a row limit as we plan the data limits to change per quarter. Below is the code that I have been using:

Private Sub Worksheet_Change(ByVal Target As Range)

'Code by Sumit Bansal from Online Excel Tips & Tutorials
' To make mutliple selections in a Drop Down List in Excel

Dim Oldvalue As String
Dim Newvalue As String

On Error GoTo Exitsub
If Target.Column = 5 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
Target.Value = Oldvalue & ", " & Newvalue
End If
End If
End If
Application.EnableEvents = True
Exitsub:
Application.EnableEvents = True
End Sub