Store-to-catalog relationship and catalog capacity
Key Takeaway
A store can have only one catalog at a time, but you can assign one catalog to several stores.
A catalog is the entire collection of products that a B2B Commerce store offers. Categories inside the catalog group those products so buyers can find them. Each store uses one catalog at a time, and the WebStoreCatalog object holds that link. You need these rules to decide which stores share a catalog, where new products go, and what to do when a catalog reaches a limit.
How a store connects to a catalog
The store (WebStore) is the hub of the Commerce data model. The catalog is the object that lets you offer products in that store.
Each product is assigned to a category, and each category is assigned to a catalog. The chain therefore runs from product to category to catalog to store. When you import data, you can choose which catalog and category each product is assigned to.
The link is limited on the store side only. A store can have only one catalog at a time, but you can assign the same catalog to more than one store.