For example, to create seven new $10 cards, grab a stack, tap gift card and select $10.  


After the first scan it will present two buttons  [Finish $10 x 1 ] and [Load Another].  Tap [Load Another] and scan new card.  Repeat again until it says [Finish $10 x 7 ].  

The new UI makes it really fast to add a bunch of cards, and the system does the counting for you.