Autodesk CIVIL3D - CIVILDESIGNCOMP 2007 SLM CD Tutorials Manual page 120

Explode
Explode: Selected
4 Click OK.
The polylines are inserted into the drawing.
Add 3D polylines to the surface as breaklines
1 On the command line, enter QSelect.
2 In the Quick Select dialog box, specify the following parameters:
Apply To: Entire Drawing
Object Type: 3D Polyline
Properties: Layer
Operator: = Equals
Value: C-TOPO-BRKL
Include In New Selection Set: Selected
3 Click OK.
The 3D polylines are selected in the drawing.
4 In Toolspace, on the Prospector tab, expand the Surfaces
collection.
5 Under the Berm surface, expand the Definition collection. Right-click
Breaklines. Click Add.
6 In the Add Breaklines dialog box, specify the following parameters:
Description: Berm-Breaklines
Type: Standard
Mid-Ordinate Distance: 1.0000
7 Click OK.
The previously selected 3D polylines are added to the surface definition
as breaklines. The surface displayed in the drawing updates.
To continue this tutorial, go to
(page 109).
108 | Chapter 5 Surfaces Tutorials
Exercise 2: Creating a TIN Volume Surface
Berm surface