New items or bestsellers: only items from one category

You want to promote a category specifically, or you regularly upload items via an interface that are updated but not new,
the shop then "recognises" the items as new and you have a problem - outdated items in the "New Items" box. the articles as new and you have the problem - outdated articles in the box "New articles"

We intervene in the code and change it so that only articles from certain categories (only subcategories, no main categories!) are displayed.) are displayed.