Document set are being used to group document having a common denominator

As such when we import document using an excel sheet, we need to have the possibility to import document and add them to a Document Set or mulitple document Set.

In the same way we have two special column, "_STATUS_" AND "_MESSAGE_"

We could have special columns to identify a Document Set and enter the ID number or the name of the set "_DocSetID01_"..."_DocSetID02_"..."_DocSetID03_"