This is a guide that will let you use existing items in your shop as template for creating prizes.
-Go to Settings > Shop settings > Inventory management.
-Click Prizes category and from here you can add a sub-category if you wish to do so.
-Click "+ Add Item" and the Add prize pop-out should appear.
-Click "Existing Item" and then click "Select Existing Item" button. From there you will be given the option to select from existing Offers or Snacks.
-Once you have selected the Offer or Snack that you want to use as a Prize, enter the amount of SP or coins necessary for redemption under Price.
-Clicking "Add" button will put this in the Prizes inventory.