I have a main category, in which are all the products and in that main category a lots of subcategories(so a product is in 2 categories: main category and another secondary). What I want to do is to filter all the products by the attribute country_of_manufacture. From what I saw this attribute cannot be changed. Is any other simple, quick method to show products only from a certain country? I want an url which if you access it will display those products(like a normal filter). For example if I want to show all products with the color blue the url would be: my-site.com/products/color/blue.html. But if a put something like my-site.com/products/country_of_manufacture/france.html. Thank you!