If you are getting the offers physically / email, the buyer may attach the docs directly in the PO - either through DMS option in item level or via GOS - attachment option in the top corner.
If you are using any tendering tools to receive quotes, you need to have the API to transfer the data to SAP along with PO and then attach to the specific documents (to DMS or GOS - Achieve link) using corresponding BAPI.
Bluesky
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