Import of goods to Bitrix Site Management MB

There is a bare aspro template (without trading catalog settings)
There are about 15000 thousand products in ~180 categories (6 levels of nesting), with a total sum of properties ~3500

It is necessary to import the catalog of goods in such a way that each category has only "their" characteristics (properties) active, each product has its own photo, description, equipment, documents (without going to third-party sites)

When trying to import last year, each category had all 3500 properties active, making adding items almost impossible.

We can prepare an import file according to your template, if there are any difficulties with this file