To help you get started, sample PKT files are included with the Autodesk Subassembly Composer for Autodesk AutoCAD Civil 3D.
Sample PKT files are included for many of the tools that are available on the Tool Box. Each sample contains the geometry of only the applicable tool. Unless otherwise indicated, the sample geometry is not shown in the context of a full, usable subassembly.
To download the sample PKT files