Private Sub Worksheet_Change(ByVal Target As Range)
Dim Oldvalue As String
Dim Newvalue As String
Application.EnableEvents = True
On Error GoTo Exitsub
If Not Intersect(Target, Range(“G:G”)) Is Nothing 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 = Replace(Oldvalue, Newvalue & ", ", "")
            ElseIf InStr(1, Oldvalue, ", " & Newvalue) > 0 Then
              
                Target.Value = Replace(Oldvalue, ", " & Newvalue, "")
            ElseIf InStr(1, Oldvalue, Newvalue) = 0 Then
                
                Target.Value = Oldvalue & ", " & Newvalue
            End If
        End If
    End If
End If
Application.EnableEvents = True

Exitsub:
Application.EnableEvents = True
End Sub

Private Sub Worksheet_Change(ByVal Target As Range)
Dim Oldvalue As String
Dim Newvalue As String
Application.EnableEvents = True
On Error GoTo Exitsub
If Not Intersect(Target, Range(“H:H”)) Is Nothing 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 = Replace(Oldvalue, Newvalue & ", ", "")
            ElseIf InStr(1, Oldvalue, ", " & Newvalue) > 0 Then
              
                Target.Value = Replace(Oldvalue, ", " & Newvalue, "")
            ElseIf InStr(1, Oldvalue, Newvalue) = 0 Then
                
                Target.Value = Oldvalue & ", " & Newvalue
            End If
        End If
    End If
End If
Application.EnableEvents = True

Exitsub:
Application.EnableEvents = True
End Sub