A supplier management tool that begins at the order.
Each distributor that offers VOS loads the items it sells you, at the rates you settled with them. You pick the supplier, speak the list, and send it. No remembering who carries what, and no digging out last month's email to find a code.
A guide of its own for each supplier, holding only what they sell you
The prices you negotiated, loaded by that supplier
Nothing for you to set up or maintain
Covers the suppliers who are on VOS, which may not be all of them