A final item description tool used in assemble-to-order (ATO) environments that defines the available product options and accessories, and builds product cost and sales price information from the options chosen. Rules may be defined to require options to be chosen from certain categories, to allow more than one choice from a given category, to not allow certain combinations of options, and other considerations that ensure product performance and safety. The configured product is identified by a base product number and an additional code that describes the option chosen for a given order.