Create a Datum Plane
- 
                From the HyperGraph 3D toolbar, click the Datum
                    Planes icon, 
.
             - Click Add under the Datum list.
 - Select the plane type: Reference plane, Cross section, or Clipping plane.
 - 
                Under Method:, set the orientation method: 
                
- Vertical along the Z axis 

 - Horizontal along the X axis 

 - Horizontal along the Y axis 

 - Three points 

 
 - Vertical along the Z axis 
 - Click two points on the curve to define the Orientation points.
 
Or
- 
                If you selected Three points, click three points on the
                    curve to define the Orientation points.
                The plane passes between these points along the Method axis.