Bringing a Plan into Microsoft Teams

Forgive me if this scenario has already been discussed, and if it has, I would appreciate being directed to it. 

I understand how I can take an existing Planner plan (O365 Group) and make it a Team, then add the Planner tab to expose it.  But I want to do is take a single Team and add multiple plans to corresponding channels.  For project management groups who work and collaborate on multiple projects, hence different conversation, filesets, and Planner plans, it would be nirvana to be able to congregate in a single Team.  (I guess I'm really asking for is the ability to nest Office 365 groups?)