You can put a sale on hold (also known as saving a sale), and pull up all the items in that sale for a later time. The steps are the same for TouchPOS and Retail View.
Add the items in the cart, then go to ‘Sales Options’
Hit ‘Save sale’, and this will put the sale on hold. A window will pop up showing you that the sale is being saved.
You can pull up any saved sales, by going to ‘Functions’ and selecting ‘Pending sales’:
These are sales that have not been paid for. You can select the saved sale, and choose to pay for it whenever you want: