The structures functionality facilitates the definition of multi-level assemblies, formulae or recipes for manufactured products, including detailed material narrations and planned scrap, and provides input to the calculation of expected material requirements and costs for jobs. You can construct quantity or percentage relationships between assemblies, sub-assemblies and components, including relationships where the number of fixed components required is related to a quantity of the batch, and where the number of components required is fixed regardless of the batch. The Component Where-Used Query enables you to quickly establish exactly where a raw material or subassembly is used within a bill of material structure. The Replace Where-used program enables you to quickly replace an item with a valid substitute component in those bills of material in which it is used, thereby helping you to streamline the introduction of product design changes.