Prism Users Guide - Chapter 3. Transactions
3.14 Hold/Unhold Transaction

3.14.1 Hold a Transaction 
The ability to hold a transaction provides more flexibility at the register. If a sales transaction is interrupted for any reason, you can put it on hold, and then unhold it when you're ready to complete the transaction. 

1.    On a transaction in progress, touch or click the Hold button.      

Viewing Held Transactions from the Customer Record
If the customer has transactions that are currently on hold, a Held Transactions button will be available on the customer record. Click the Held Transactions button to display a list of held transactions.

3.14.2 Unhold a Transaction
(If the transaction is not displayed, go to the RP Prism home screen and touch or click the Pending Transactions button and search.)
1.    Touch or click the Unhold button.     
2.    Complete the rest of the transaction and print/update.