Open orders is a feature that allows merchants to continuously add to a clients bill till they eventually decide to pay. This is being used by many restaurants as well as retailers.
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Swipe from right to left when on the Products screen and you will see that the Open Orders menu appears.
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You can switch between Open Orders in this menu and keep adding or editing the bill till you eventually decide to make the final transaction and bill the client or table.
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You can change the number of open orders or tables by going to Menu>Settings>General and changing the number from the default 5 to whatever you prefer.
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You can even edit the names of each Open Order by opening the Open Orders menu and clicking the edit icon on each order