Have categories show up on front page from all sites.

I will be using the gridmarket which as you know is the child theme of frame market. I will be doing a series of sites as shops and setting it up etsy style. With marketpress etc..

I want all sellers to use the categories I set out which I have done via new blogs... I know there is a widget I can use and the category they select will show on the front page..
The problem I have is that is does not appear as a category then subcategory like I have set out and also not in the order the categories are.

Is there any way I can get the categories to show the way I want them and in order for all sites please