The "Products in blocks" module allows you to display products in blocks on the category page - in each block, products from a subcategory of this category,
at the bottom of the category, the list of products is displayed as usual. If you remove it from the parent category only products subcategories will be displayed

By default, the module is made for a default template.if your template is very different from the default one, you will probably need to modify it.
No system files are erased, the module uses ocmod.

The modifier outputs products in blocks - the quantity is set in the admin panel

works on 2.0 - 2.1 - 2.3 - 3.0