In the video I'll show you how you can delete walls without scripts just with a simple trick. Whenever you do this as mentioned above it is a bit vague so I'll used an addaction but that could also be done by just killing the unit instead with zeus. Like you could add a timer let it countdown for xx minutes and then let the trigger do hes thing.
Mission file: https://1drv.ms/f/s!AhDyo8i8-LaqhRZFm9GVj44KLf51
The thing is because I named the walls I can easily delete them with:
deleteVehicle VR_Wall1;deleteVehicle VR_Wall2; etc etc
Now its just a thing of thinking up which way you want the trigger to shoot.