To combine gift cards, go here: https://m-secure.target.com/giftcards/sign-
in
1. Create an account with your phone number and make up a pin.
2. Input all your cards separately
3. Go into any of your gift cards and hit the combine button
4. select all cards to combine
5. you will end up with one gift card with all the $ on it
6. Use that barcode when checking out at target.
(thanks vinylmp3s)