Categories List Module

Hello - how do I get my 'Categories List' module to look like the one in the EasyDiscuss support form here ---> https://snag.gy/JepA1G.jpg

I have three main categories - Announcements, Principals and Teachers. I'd like the list to display in accordion, like yours - with only headings Announcements, Principals and Teachers showing with a click down arrow to show sub-categories.

Is this possible?

Thanks, Julie