Hi again, I'd really appreciate if you could help me, as I am really stuck here, nobody could solve this problems in other forums, it's a challenge.

Group function definition:

Function Group(Optional ByVal Start As Object = Nothing, Optional ByVal End As Object = Nothing, Optional ByVal By As Object = Nothing, Optional ByVal Periods As Object = Nothing) As Object
Member of: Microsoft.Office.Interop.Excel.Range