Apply VBA code to multiple cells

Hi there,

I'm trying to make a drop-down menu within which multiple answers can be selected. I found some code online that I copy-pasted into my file and it works great, except that it only applies to one cell. I would like to have this multiple-selection enabled dropdown menu for a whole column of cells on my sheet.

Here is the code:

Private Sub Worksheet_Change(ByVal Target As Range)

    Dim oldVal As String
    Dim newVal As String
    
    If Target.Address(0, 0) <> "I4" Then Exit Sub

    On Error GoTo ReEnable
    Application.EnableEvents = False
    newVal = Target.Value
    Application.Undo
    oldVal = Target.Value
    Target.Value = newVal

    If oldVal <> "" And newVal <> "" Then
        Target.Value = oldVal & ", " & newVal
    End If
ReEnable:
    Application.EnableEvents = True
    
End Sub

...where I4 is just one of the cells in which I would want this kind of drop-down menu to appear. I have never used VBA before, so the answer may be obvious to others, but my question is: how can I apply this code to cells other than I4?

Thanks!