Autodesk's Jeff Bartels explains how to employ Civil 3D Subassembly Command Settings to standardize Subassembly naming conventions.
From the Jeff Bartels YouTube Channel.
and the Civil Immersion blog.
Jeff's Command Setting tip(s) is helpful if you want to reduce renaming chores in your Civil 3D Assembly constructions.
It is worth the time to watch the video to better understand how important Subassembly name conventions are to optimize your production Corridor work.
The current interface and construction method for Assemblies in Civil 3D gives us no access to these Subassembly Settings within the process.
Needless to say, any Subassemblies in Assemblies already built must be correctly Grouped and renamed in some logical way to be more useful.