This type of question comes up from time to time relating to designing the jumps for a BMX or Motocross track. In the video below I show conceptually how to go about doing that and how to incorporate the updated vertical alignment as a Vertical Alignment for the Corridor model defining the track itself.
The video shows how you can dynamically change elements of the vertical alignment from vertical Curve to Vertical Arc, change the VPI Elevation, change the Vertical Radius or the Length of the Vertical Curve. If you have incorporated the HAL / VAL into a corridor model, the corridor surface will update dynamically to changes in the vertical alignment profile, giving you a 3D visualization of the BMX / Motocross track.