What is the link between Purchase order and Payment Manager

Hello,

We have new business requirement for vendor payment to be made against PO based on the buyer request.

Requirement.

We purchase materials from one vendor with difference two purchase order with same payment term of 30 Days. We need to make payment after 30days from Good received date for 1st purchase order and need to make payment after 7 days from goods received date for 2nd purchase order.

How to differentiate this two Purchase order and make payments accordingly.

Thanks

Mohan