Autodesk CIVIL3D - CIVILDESIGNCOMP 2007 SLM CD Tutorials Manual page 742

9 Expand Modifiers. Right-click Box and turn off the visibility. Turn on the
visibility of Box Outside and Box Inside. This displays the appropriate
modifiers for dimensioning.
10 Right-click Model Dimensions and then click Add Distance. Click the
outer box extrusion in the drawing, then click a location for the
dimension.
Dimension LenB3 is created.
730 | Chapter 18 Part Builder Tutorials