Add to an array information that is displayed from the Bank in a Dropdown

I have a dropdown that displays the information that is saved in my BDM, are several products, what I need is to make a kind of page in the UI Designer as if it were a shopping cart so that the user can make an order with several products , Is it possible to do this, add in an array with all the selected products and their respective quantities? I've got in the Expense Reports example to add line through a button however the second line is already coming populated as the same content as above