PO Creation for NON-System Items

SUGGESTED

Hi, 

I would like to know what the best way is to create purchase orders for products that do not exist as items within the system. We have many items that we'd like to issue purchase orders for but they are not setup as products in Sage. For example, if we want to issue a PO for 500 reams of paper, we want the ability to create the PO and send it to the suppler without having to add that specific paper into Sage. 

What is the best way to do this? 

Thanks in advance.