To transfer specific parts using the
Generate Downstream Structure action, you need to create a custom attribute on the part or
Part Usage link. After assigning a value to this attribute in BOM Transformer, the
Generate Downstream Structure action identifies the parts with matching attribute values between the upstream and downstream structure and adds the child nodes of the matching upstream part under the matching downstream part. Additionally, you can specify the types or subtypes of the parts that should be transferred from upstream to downstream.