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First off, SEO learner, not a professional, therefore question is not for any client. A new (less 1 yr) ecommerce site in a particular sector is now moving into partnership with relevant websites to be their online store. A 'store' link on the partner site will redirect to the ecommerce domain to a dedicated area (on a domain/directory path) with the partner's branding. To do this though means duplicating the entire catalogue for each partner that comes on board for this scheme. So the original ecommercesite.com/categories also delivers ecommercesite.com/partner1/categories (with partner's brand identity) ecommercesite.com/partner2/categories (with partner's brand identity) and so on Won't duplicating the product catalogue in directories cause problems in delivering effective SERPs for the original ecommerce site?