Dear kathy,
In Vendor Master you have the option of maintaining Alternatee Payee.
Original Use:
1. alternate payee is used in case we invoice vendor A, by using alternate payee in vendor master we can pay Vendor B and the open item in Vendor A can be cleared.
Kindly check if this will help you in any way, by this field we can link A&B, standard report will be available to get this linkage in SAP.
Regards,
M S Lokesh