Store Product versus Store Assortment for making products available
Key Takeaway
Use a Store Product record to link a single product directly to a store, such as an ad hoc product added because of its performance. Use an Assortment, linked through Store Assortment, for a set of products the store most certainly sells.
In Agentforce Consumer Goods, you make products available at a store in two ways. You link products one at a time with the Store Product object, or you group products into an Assortment and link the whole group with the Store Assortment object. The right choice depends on whether you're adding single products or a known set of products.
Products in the data model
Every product is a record in the standard Product2 object. Each record is a SKU (stock-keeping unit), which means one sellable unit. Store Product and Store Assortment then control which of those products are tied to a given store.