Improvements on the site on opencart

Theres a new website on opencart is still quite empty.
In one of the structure sub-categories (collections)
that would have the ability to filter by sub-category according to several parameters.
Need and filtering the product
This is the online shop of ceramic tiles and sanitary ware
Inside the section should look something like this
mosplitka.ru/catalog/plit...

Payment upon completed work. It is possible to advance