SMP divides products into a four-level hierarchy of increasingly narrow product groups with the fourth level being individual products. You can filter market analysis lists based on the top three product levels (Prod Level 1, Prod Level 2, and Prod Level 3). If you select a second or third level filter, you must select all higher level filters. For example, you can create a market analysis list of all customers who have purchased industrial control products by selecting Ind Cntrl from the Prod Level 1 filter menu. If you want a list of customers who purchased Sensor products (a subdivision of industrial control products) you would have to select Ind Cntrl from the Prod Level 1 filter menu and then select Sensors from the Prod Level 2 filter menu.