A Bill of Materials (BOM) defines a relationship between one SKU and a set of component SKUs. For instance, a SKU “Widget-A” could be made up of of three components “Component-A”, “Component-B”, “Component-C”. Placing an order for SKU “Widget-A” would result in “Component-A”, “Component-B”, “Component-C” automatically being fulfilled in it’s place.BOMs can also define relationships between similar products in different pack/case sizes. For example if “ProductA-12” is a case of 12 single products, and “ProductA-1” is 1 single product from a case of “ProductA-12”, then a BOM relationship could be created to allow orders for “ProductA-1” to be fulfilled by splitting a case of “ProductA-12”, which would avoid having dedicated inventory for “ProductA-1”.