Once you've downloaded the subassembly pkt files, follow these steps to install and use them in Civil 3D:
What are you trying to model? (e.g., a specific curb type, a retaining wall, a benching ditch?) What version of Civil 3D are you currently running? civil 3d subassembly pkt download free
Constraints that allow the subassembly to dynamically grip surfaces, alignments, or profiles. Once you've downloaded the subassembly pkt files, follow