If you want to dismantle the tank, you first need to detach the turret from the hull. To do this, you have to enter the tank and press the HOME key. This will disconnect the turret from the hull, and the tank will transform back into the turret and hull. Now, to transform the turret and hull back into an item, you need to click on them with the wrench. Remember that if you want to dismantle the hull, its health points must be at 700; otherwise, it won’t be possible to dismantle it