As you may already know, poking around in the part builder is no walk in the park. If you are thinking about making edits to the Part Builder, MAKE SURE YOU CREATE A BACK UP OF THE ORIGINAL CATALOG. The parts available are not all inclusive. Many materials are not available or do not have the correct thicknesses or preferred name. Once you have modified, tweaked, enhanced, and turbocharged your Catalog into a masterpiece, back that up too.
Although building this content may seem daunting, the Parts Catalog can be set up once and can be shared with other users across a network. The default Pipe Catalog install location for 2014 is:
C:\Documents and Settings\All Users\Application Data\Autodesk\C3D 2014\enu\Pipes Catalog\
To set another catalog location, from Civil 3D go to the Home Ribbon > expand the Create Design panel > select the Set Pipe Network Catalog button.