No, my shops have all the goods in my warehouse so I don't need supplier lists. I can see this helpful for dropshipping retailers. But in the same time the customer sees 2 orders with the same number, pretty confusing. Probably this order splitting should be made differently, even if they expect 2 orders from 2 warehouses.
I had it like that because when I started my first shop I had ASM on and all products where there. As years progressed I saw few bugs (that I don't even remember now) and started clicking 'enter manually' on each new product.
Now ASM is disabled and life is better. Or at least until datakick don't release his warehousing module and I see some cool features that I need (then it life would be better 😄 ).