Hi again @riverston86.. I can partially answer your question.
As far as the Square for Restaurants POS on a tablet goes, once you have your floor plan table layout, you can open as many checks as you want for one table. I learned this quite by accident. In my shop, we have only walk-up window service. So my floor plan is simply two tables -- one for the left window and one for the right window.
One day, both myself and a team member opened up checks simultaneously on the same table. When I went to close mine, I noticed two open transactions -- one assigned to me and one to the other team member. So, I picked mine, closed it and the other one remained active. It seems that multiple checks on any table is a feature, already.
My assumption would be that the same is true of a Terminal configured as a Restaurants mobile device. But, I can't say with 100% certainty that this is true. Still, you should be able to test that theory out with a couple of test checks yourself. The best part is that there will be none of the "splitting" headaches, as long as people know ahead of time how they will be paying.
Chip A.
Square Expert & Innovator and member of the Square Champions group. (But NOT a Square employee, just a seller like you)
Was my post helpful? Take a moment to mark it as a solution. Marked solutions help other sellers find possible resolutions to similar problems. Also, if you find your solution elsewhere (say, through Support), it is helpful to come back to your post and tell us about it, then mark that as a Solution. Solutions are what this Community is all about!
