The category tree in Store Commander allows you to easily navigate through the various categoies of you site.
Select a categori to display the products present.
In the case where you have parent categores with sub-categories, it's possible to display products in all of these categories (of the same parent) without having to change sub-category one by one.
To do so, enable the option on the category toolbar and then select a parent category.
All products will then be displayed in the central column, allowing you to work on a family of products.