Looking for a way to do a sub-menu

I’m looking for a better way to organize my dashboard. I currently have a tab for each floor and then I’ve grouped switches and other items on that tab for each area of the floor. What I’d really like is a sub-menu format. I’d like to click “main floor” from my top menu bar and have a sub-menu drop down that I can then pick Kitchen, great room, office, etc and have all my entities for that area show up. Something like this:

I’ve looked at the sidebar card, but I’d really prefer to have the sub-menu along the top to make it easier to use on mobile devices. Does anyone know of anything like this?