Is it possible to know the nesting level and output of products from multiple categories?

Question

opencart

Good afternoon, the situation is as follows. I
ran into 2 problems
1) We get products from 1c, the level of nesting there is just huge, they decided to reduce it. The question is, is it possible to get into a variable at what level of nesting are we now?
2) If there is the following structure Catalog - Fast food and in fast food there are such categories as burgers, hot dogs, etc. The question is, is it possible to bring all products that belong directly to child categories into the fast food category?