Denver Research

I have EZ power POS 13 for bookstores. I would like all of my books to have the option of being sold or rented. I tested it with one of the books. It has a used price of $10.00 and I set the rental price at $3.00. When I pull up the product in the sales window, it only pulls up the rental price. How can I make it give me the option of one or the other? Also if I do rent the object is there any way to require customer info at the sale screen?