[AskBug] Adding seperate page for sub categories

I would like to add subcategories within the main categories.

I would like to show two tiers of categories in the side column on the main page (categories and subcategories), and when a user clicks on a category, I want to redirect users to a page with the subcategories that is like this one (http://demo.anspress.io/askbug/questions/categories/)

Is this possible?

Thanks!!