How to add a marketplace like Amazon as seller?

I am trying to figure out how to record purchases done on a marketplace like Amazon because, in the Marketplace, Amazon is not the actual seller. However, PO may be raised against Amazon as a supplier, but we may record receipt against the actual seller based on the Invoice.

  1. Do we create a new supplier group for this?
  2. How do we add items in this case?

I am looking for the best practices for this transaction.