Docsdonix SiteCommerce
Collections
Screenshots are illustrative. Use the account, domain, and application names configured in your own admin.
Group your products. One product can belong to several collections at once.

Collections vs. categories
A category is what the product fundamentally is (skincare / household cleaning), and usually there's one per product. A collection is a marketing grouping (new arrivals, Mother's Day picks, selling fastest). A product can sit in several, and they come and go with your campaigns.
Question: Can a collection update itself?
Yes. Set conditions (a price range, a tag) and matching products join automatically, with nothing to maintain by hand.