Multi-brand and your catalog
Commerce models brands separately from products. A product can have multiple brand associations, and each association can carry brand SKU and brand-scoped SEO values.
Current UI behavior
Open a product in Catalog to assign or remove brands and edit the slug, meta title, and meta description for a selected brand. The editor keeps per-brand SEO drafts while you switch between assigned brands and saves changed associations.
Channels require a brand, and Marketing, SEO, discounts, pricing, reviews, and storefront data also use brand IDs for scoping.
There is no dedicated Brands route in the current Commerce application. Brand create and update operations exist in GraphQL, but the documented operator pages primarily select existing brands. Do not promise self-service brand administration from a standalone page.