How to make WP WOOCOMMERCE become a child page?

Question

PHP

The problem is that the parent css styles of the 1st level elements are not saved in the site menu (when I use WOOCOMMERCE on the 2nd level). Those. for example, menu level 1 ( Sell ) -> menu level 2 of this element: page No. 1, page No. 2 and product catalog (here WOOCOMMERCE is connected).
As soon as you go to the catalog or the products themselves, the menu does not save the styles of the parent element (ie "For sale"). In other words, no hierarchy is supported.
In the admin panel, the menu set the page "Product catalog" as a child, but this did not help.

Answer 1

Everyone understood correctly)
I figured out that I need to add this style, but I don’t know how to add it.
How exactly to assign this style to a block? where to write it down?