Use the New/Add > Assemble action in the BOM Transformer to create multiple alternate downstream assemblies from assemblies in upstream structure. You can also use this action to manage these assemblies. For example, a neutral color car door assembly is present in the upstream structure. You can use the Assemble action, to create car door assemblies with various colors in the downstream structure and manage them. All the downstream alternate assemblies that are created by using this action are mutually exclusive of each other.