From the main menu bar, select .
A Create Section dialog box appears.
Enter a section name. For more information on naming objects, see Using basic dialog box components.
Select Beam as the section Category and Truss as the section Type, and click Continue.
The truss section editor appears.
Select a material for the truss section. If desired, click to create a material; see Creating or editing a material, for more information.
Enter a value for the Cross-sectional area.
Click OK to save your changes and to close the truss section editor.