Create 3 entity screens. Name them section 1,2 etc… and custom layout in each screen.
Under each entity screen go to mappings and you can specify individual users to each screen. This way sect 1 user will only see sect 1 etc…
Then main menu>pos>sect 1 button. Right click click dev mode. Right click agaim and add widget table layout or add individual button. Bottom right save.
Do this for each screen in administrator user abd then logout and test each user
Are waiters working on same section ?
Yes, Mostly but not always, so need to define few roles, which will determine sections. So i can assign waiter to those sections resp to display tables.