Alan Gilbert from Autodesk discusses a technique to import a local survey data file into a Survey Db that will auto-rectify to previously imported Known Control points.
Alan points out a classic Civil 3D wizard issue in this video. We tend assume a wizard is doing what we expect instead of what it actually does.
See Alan's previous video RW5 Import and Traverse Adjustments that is mentioned.
See Alan's follow up video Import Fixed Point Data and Correct to Known Control.