The substitute part can be a derived part created from the source assembly. If the substitute part is created in the source assembly by using the context menu selection “Derive Assembly,” the part is automatically tagged as a Substitute during the derive process.
When a Substitute Level of Detail is active, all other components are suppressed and hidden in the browser. Significant memory savings can be realized by inserting an assembly with a Substitute Level of Detail active into an upper-level “consuming” assembly. In the video pay attention to the capacity meter watch what using derived assemblies and substitute LOD can do for you.