Autodesk CIVIL3D - CIVILDESIGNCOMP 2007 SLM CD Tutorials Manual page 454

Add subassemblies to the second level
1 Using the Generic tool palette, add a
subassembly to the Cut 5.00 : 10000.00 conditional subassembly using
the following parameters:
Side: Left
Width: 12.0000'
Slope: -2.000%
2 Using the Retaining Walls tool palette, add a
subassembly to the LinkWidthAndSlope subassembly using the default
parameters.
3 Using the Generic tool palette, add a
subassembly to the Cut 0.00 : 5.00 conditional subassembly using the
following parameters:
Offset From Baseline: -60.000'
Omit Link: No
442 | Chapter 12 Corridor Assembly Tutorials
LinkWidthAndSlope
RetainWallVertical
LinkOffsetOnSurface