Sub-Categories

After a year of running a big enough server I've reached a technical limit.

I read through some old Sub-Category post yet they all seem to be a year in between interval of posting.

My issue: We have a Category of 32 Channels total. (I'm using this Category as an example as we have other categories with more or less the same channel count). These categories will benefit from having Sub-Categories that are collapsible within a major category. 

This could clear some clutter from Channel heavy servers as well as keep power users engaged in a community with lots of channels.