Autodesk CIVIL3D - CIVILDESIGNCOMP 2007 SLM CD Tutorials Manual page 745

Set list to 4,8,12
Set the value to 4
Add SIL (Inner Structure Length)
Change to List
Set List to 12 inch increments from 48 to 120
Set value to 120
Add SIW (Inner Structure Width)
Change to List
Set List to 12 inch increments from 36 to 60
Set value to 60
SRS
Change to Range
Set Minimum Value to 36
Set Maximum Value to 120
Set Default Value to 72
Fth = Floor thickness and Wth = Wall thickness. These parameters will
be available in three sizes, and will be editable structure properties in
AutoCAD Civil 3D.
SIL=Inner Structure Length and SIW=Inner Structure Width. These
parameters will be available in a number of sizes at 12-inch increments.
These are the key structure properties that control the length and width
of the part in AutoCAD Civil 3D.
RS=Rim to Sump height. This is a key structure property that will allow
the depth of the structure to be controlled in AutoCAD Civil 3D.
Click Save Part Family when you are finished so that the part is saved,
and the Model Parameters are updated to include the new Size Parameters.
16 Right-click Size Parameters and then click Edit Values. Change the
following:
SBSL=120
SBSW=60
Exercise 4: Finalizing the Part | 733