Autodesk CIVIL3D - CIVILDESIGNCOMP 2007 SLM CD Tutorials Manual page 732

is in the correct position. Repeat this process for the three remaining
lower edges.
This creates geometry that is linked to the lower edge of the frame
extrusion. This is a key relationship in building the box section below
the frame so that it is aligned with the frame. The projected geometry is
displayed in green.
8 Set the visibility of all geometry and profiles in the Rim work plane to
off. Right-click Top of Box and then click Set View. Objects in the Rim
work plane are turned off so that you do not snap to them or use them
inadvertently.
9 Right-click Top of Box
for rectangle points.
720 | Chapter 18 Part Builder Tutorials
Add Profile Rectangular. You are prompted