I feel like with selling multiple items you need to really have a understanding of each of the sunglasses and brands each of these brands offering a unique thing. As experience comes, you learn to become more comfortable with each of these brands. When it comes to selling multiple items, you need to understand the customer as well. The customers each customer has a different sense of style so if you can kind of ask, more personable questions without being too personable, you can kind of figure out each person style.