Figured it out.
Now only thing i need, is the amount of the unpaid tickets.
My setup is made so customers can pay later. So I DON’T want to use the customer account thing, because te staff is not smart enough to handle this. They say its too complicated.
So I made a sort of “Pre-order” system with this post:
https://forum.sambapos.com/t/work-period-2-or-3-shifts-in-a-cafe-restaurant/1147
So I made a button to “park” a ticket.
And Finaly got the End of Workperiod correct.