wont work

[xKoiFish]

so managed to get this to somewhat work but whenever i try to use parts it automatically cancels after pushing E, also i seen on a server i played on that u can make the blueprints a lootable item that has certain vehicle assigned to that blueprint that u can then use and it will instantly spawn the car blueprint onto the ground how do i go about doing this? if u need a reference to what i mean go on the fivem server called project insomnia and ask a player for a vehicle blueprint