When you first try to open the ordering panel you'll be asked to assign a price list if you haven't already. The layouts that appear in the ordering panel are those that have a price defined in the price list assigned or you can tap Custom Price to add a one-off price.
Select the quantities for the items you'd like to add to the cart and finish up by tapping the button "Add to Cart".
Copyright © 2014-2019 Britton Mobile Development. All Rights Reserved. Apple, App Store, and iPad are trademarks of Apple, Inc.