Accessories are products that are attached to base items (products). An example would be a case for a laptop computer. If the buyer looks at the laptop base item, they can link to "Accessories/Options" and find the case. Base Item (Product) - Base Item refers to an individual product in a Product Catalog. The Base Items are usually assigned to an XLS file named BASEITEM.XLS (formerly SenSoft used "LINEITEMS.XLS). Commercial List (MSR) Price - The suggested retail list price as set by the manufacturer. Contract Administrator - the person at your company who handles all contract issues.