I am both a buyer (purchasing from suppliers) and a seller (selling to my own customers). How do I manage this?

Patisco supports the Diffusible mechanism (supply chain diffusion): Your account has both seller and buyer roles simultaneously. As a seller: Manage your own products and customer orders in "COMMERCE". As a buyer: View your supplier list in "RELATIONSHIPS → Seller Management". In "COMMERCE → Orders" you can see the purchase orders you place with suppliers. Both roles switch seamlessly in the same backend interface.