This tab allows you to define YOUR part structure for the saleable parts/assemblies you sell to us, showing each part at each level within a Part Tree, or Bill of Materials (BoM) structure. Begin by entering your top-level part (the end-item sold to us), and continue filling-in the complete BoM part structure for each. The leaf-level parts (those parts that have no sub-parts) need to be fully disclosed on the Part Detail tab (below). Complete this tab second.