At the moment it is not possible to limit specific products to specific customers. Only "Product compliance" can be configured. But that limit specific products for a whole country.
Many companies has customer specific products - meaning customer A has exclusive rights for specific products and these are not allowed to be sold to other customers.
There is no way to configure this.

The same issue is on e-commerce for b2b sites, meaning somehow assortments per customer (and not retail store) is required to be configured