Multiple Selections When Using "Modify With"

Example: customer chooses a baked potato as a side option and wants to add Sour Cream, Bacon, and Cheese. Right now, employee can only select one ingredient at a time after selecting the "Modify With" option tied to the Baked Potato. Ideally, the employee would ring in the Item, select the side of Baked Potato, select Modify With, select all 3 ingredients, then select Ok.