Originally Posted by
Widgets
Up to 8 passengers traveling with the same confirmation number as a medallion passenger automatically enjoy the same baggage allowance as the medallion customer.
Passengers traveling with a different confirmation number, but with identical itineraries as a medallion companion enjoy the same baggage allowance as the medallion customer; however, the medallion customer should be present at check-in for the bag fees to be manually waived.
I'm not aware of any way to "link" a PNR so that bag fees for non-medallion companions are automatically waived.
This is exactly why I was asking whether there are one or two PNRs. The OP still has not clarified this.