VBA add a line :(

Good day everyone,
I have a simple question for guys like you (more complex for me).. I have a table, in this table I have one line where i have a drop down list. Depending on the choice, i need a line to be added.
you will find an explanation attached
May I ask you help for this?
Thanks a lot
Guismo30

Perhaps such a code, placed in the sheet module, will be enough:

Private Sub Worksheet_Change(ByVal Target As Range)
    If Target.CountLarge = 1 Then
        If Not Intersect(Target, Me.ListObjects(1).ListColumns(4).DataBodyRange) Is Nothing Then
            If UCase(Target.Value) = UCase("Extend") Or UCase(Target.Value) = UCase("Modify") Then
                Application.EnableEvents = False
                With Target
                  .Offset(1).ListObject.ListRows.Add .Row + 1 - Me.ListObjects(1).DataBodyRange.Row + 1, True
                  .Offset(1, -2).Value = "Please add the product number"
                  .Offset(1, -1).Select
                End With
                Application.EnableEvents = True
            End If
        End If
    End If
End Sub

Artik

Wouw amazing thanks soooo much!!!! it works perfectly thanks again !