You can combine receipts that were previously split using selected items or split by seat. For example, if a table of six all want to pay their portions of the bill separately except for seats 2 and 3, you could split the original bill by seat and then combine receipt 2 with receipt 3. 

1. On the Order screen of Restaurant POS, tap the Pay icon.
2. Split the bill either by seat or by selected items. 
3. At the top of the Payments screen, tap-and-hold the receipt you want to combine to another.
4. Tap the other receipt in the menu you want to combine it with. 
5. Tap OK to confirm.