There are two ways to go about this:
First method (setHit):
1. Place an empty Panther in the editor named "bob" without quotes.
2. Get in the vehicle as the driver.
3. Press escape and open the menu, and enter "bob setHit ["pas_L", 1]" in the debug executor, followed by pressing local exec.
4. Attempt to drive the vehicle, and note that it is still moving despite having a completely destroyed track.
5. You can repeat this on the other track with pas_P. It will not make any difference and the vehicle will still operate.
Second method (explosives):
1. Place an empty Panther named "bob" and an explosive specialist (as player) in the editor.
2. Place an explosive charge close to the Panther in game, and detonate it at a safe distance.
3. Get in as the driver of the Panther. If you've taken engine damage, use "bob setHit ["motor", 0]" to repair the engine to full health.
4. Note that, as before, the vehicle is still functional and drivable despite the tracks being completely destroyed.