This behavior is used to create a link to remove products from the cart. This behavior must be applied to a link that is inside a Cart Repeat Region.
Link:
In this combo you will find all the link element in your page and you must select which link you want use to remove the product from the cart or you can select the Create New Link options. If the link you select is not inside a Cart Repeat Region an alert message is displayed and the link is not created because the button must have the reference of the item you want remove and the cart get this reference from the repeat region index.