Click Support
or select Insert > Support...
Select a 3D shape representation in either the specification tree
or the geometry area.
The Support Definition dialog box opens:

Enter or change the name for the support.
Select the point through the support to define the position of the segment when it will be routed through the support.
If the point is not already defined, click the Point
button.
For more information, refer to the Generative Shape Design User's Guide: Creating Wireframe Geometry: Creating Points.
Select a first plane to define the way into the support, for
example, a face.
Select a second plane to define the way out of the support, for
example, the opposite face.
Note:
The two planes must be parallel.
Click OK to validate.