The Autodesk® Civil 3D® guide includes the following sections:

NOTE: LAS format is no longer supported as import format in Civil 3D. Read the AutoDesk article here:

The suggested workaround is to use Recap to insert a LAS file as a Point Cloud into Civil 3D. More info:

 Autodesk Civil 3D is not Nearmap product, and as such any support you may need should be directed to Autodesk. Check out Autodesk's Knowledge Network at: