Best Business Practice for PO configuration when Payment is due in installments for inventory materi

Let me start by saying I am a Novice when it comes to the Procurement module.  But in my new role in the company I am trying to improve how we utilize Oracle and our business practices.  In a recent Q/A session I learned that for some of our suppliers that we buy inventory material from they require payment installments up to final delivery of the inventory.  They way our company has been handling this is to receive the inventory item as partial delivery.  I clearly know this is wrong on numerous levels, I just dont know how best and