I am not sure I totally understand what your set up wish is, but here's what can be done at the moment, perhaps it will work for you.
There is a multi-store within Abantecart -
- one backend to manage all stores
- use different templates on each store
- display different products/categories on each storefront
- display different blocks, banners... layout (by modify store's template)
- localize each store by setting a different default language, currency.
- setting different shipping and payment methods.
Each store has a unique URL - either a subdomain or a totally different URL.
There is ONE database, you can have different pricing in each location for the same product, and each store can turn on or off the products on their store. Each store has complete control over their items and can add new products as they wish. The only thing to be aware of is every store and see all the products from store. If you think of one store with multiple locations, that is the design currently.
If this doesn't answer your question well enough yet, keep asking.
Lee