Autodesk Civil 3D subassemblies are preconfigured AutoCAD drawing objects that let you design three-dimensional sections of roadways and other corridor-type structures.
These Help topics contain detailed information about the construction and behavior of each subassembly included in the Autodesk Civil 3D Corridor Modeling catalogs. Lists and descriptions of input parameters, output parameters, target parameters, and coding diagrams for each subassembly are also included.
For more information on how to use subassemblies for corridor design, refer to the Subassemblies section of the Autodesk Civil 3D Help.