I have the point of sale app on iPhone and iPad. On the iPad app, you can create a ticket for a customer (sort of like starting a tab) and save it. But there doesn't seem to be the same option on the iPhone unless I am missing it...which is quite possible.
Hey @DR22 - Yes! You can use the Open Tickets feature on your iPhone. Here's how to enable it:

From there, you'll see a "Tickets" button on your main Checkout screen from your iPhone. Your tickets will sync across any device you are logged into for Square.
For more information, check out Open Tickets in our Support Center.
Square Community
Square Products