Field manufacturer and sorting by manufacturer in category

Could you please add a manufacturer field to the ecommerce module? It would be really good as if you could click a manufacturer in a category and display only their products. Currently this can be done with tags, but clicking on a tag shows all products tagged with that tag, and it would be better if by going into a subcategory you could display only the products of the selected manufacturer. For example, we have Adidas and Nike brand shirts, but we would like to display only Nike shirts (not shoes, not pants, etc.).

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