Multiple Purchase Receipts against a single PO

I am trying to figure out how to have multiple purchase receipts againt a single PO. For example, if a vendor shipped the PO in staggered shipments, and we want to have multiple receipts against that PO.

Can someone post on how this is done? I see that the Purchase Receipt gets linked back to the PO in the “PO History” tab. But I can’t see how to add an additional Purchase Receipt once a single receipt has been entered...