Autodesk's Alan Gilbert walks through an in-depth, complete, and complex retaining wall subassembly example in the Subassembly Composer.
Alan's retaining wall PKT solution presented here solves the classic stepped retaining wall design issue.
My issues are in the details - like not employing the existing Civil 3D stock subassemblies Codes to make the PKT more compatible and easier to maintain.
Ok. It is a not-so-basic how to on the Subassembly Composer not targeted at standards development and maintenance.
Videos is this series