The document discusses how bills of materials (BOMs) are processed in sales orders in SAP. A BOM lists the components that make up a finished product. When entering a BOM in a sales order, the system will process pricing, inventory, and delivery either at the main item level (treating components as text) or component level. The type of processing is determined by the item category group entered in the material master record. Processing at the main item level aggregates these functions to the final product, while processing at the component level applies them to each individual part.