Hello,
If you want to create those PO's for vendors and materials (multiple materials) separately, yes you can do so using t-code: ME59N i.e. by converting those PR's to PO automatically via Purch. Requisitions but for that you below are pre-requisite:
> Material master (purchasing view) - tick/flagged for the automatic PO allowed check box
> Source list should exist with vendor and material combination - fixed source and MRP relevant
> Purchase Info record should also exist with material and vendor combination
Hope it clarifies you.
Regards,
Srinivas