How to display sub menu?

Question

1C-Bitrix

Good afternoon.
Tell me how to display a subsection menu site in the basement. That is, we have the following structure:
Category
-- Subcategory
----Page
----Page
----Page
--Subcategory
----Page
----Page
----Page
-- Subcategory
-- --Page
----Page
----Page
--Subcategory
----Page
----Page
----Page
It is necessary to display 4 columns in the footer in which there will be only menu items from "pages", and the title columns can be either Subsection or arbitrary wording

And another question. I am displaying a menu of 2 levels, the first of which is actually a subsection. The structure is the same.
Everything is fine on all pages up to the "Page" nesting, but on it a single-level one, consisting of bpo points of the current subsection, is displayed, although it is necessary that subsections and nested pages be displayed to them.