Not sure if I'm using this feature as you intended, but I have a vendor (Faire) that we purchase COGS Products from. This vendor carries the products from MANY individual companies/small businesses/vendors.
I've set it up like this…
I made the client "Faire" and each individual vendors is a projects. This list will grow indefinitely and it's quickly going to become unmanageable since (A) there's no search feature and (B) there's no decreeable sort order.
Ideally, default sort order would be alphabetical.