Multibody parts are not supported in manufacturing assemblies. You cannot assemble reference models with multibody parts in NC, mold cavity, cast cavity, CMM, Manufacturing Process, and Expert Machinist assemblies. The message area shows a prompt whenever you try to assemble such a part. In the NC, Mold and Cast cavity assemblies, you can assemble a multibody part with the Merge and Inherit commands only as a reference model. However, the part will show only one body after you inherit or merge it. In this process, no data is lost as the multiple bodies are converted into one body.