Autodesk CIVIL3D - CIVILDESIGNCOMP 2007 SLM CD Tutorials Manual page 645

5 Press Esc.
Grip edit a network part
1 Select the pipe on the far right side of the profile view.
2 Click the grip. Drag the grip up to increase the invert elevation. Click
to place the grip.
You can use grips to graphically change the position of pipes and
structures in both plan and profile.
Exercise 1: Creating a Pipe Network from a Polyline | 633