u need to get a car go to a position where u want to spawn and then u put /s (inside the car) and the coordinate will be saved in \GTA Vice City\vc-mp_saved_coords and it will appear like this
"Vehicle = 156 -1675.3804 -216.5843 14.6671 1.4434 46 1 ;"
you need to change it like this "1=156 -1675.3804 -216.5843 14.6671 1.4434 46 1"
and then u put it in \Warchiefs v1.0\scriptfiles\Vehicles\Vehicles.ini
here an example
1=155 -1661.2036 -225.9701 14.8505 83.3180 40 44
1 = Car ID
155 = Car Model ID
-1661.2036 = X Coordinate
-255.9701 = Y Coordinate
14.8505 = Z Coordinate
40 = Color1
44 = Color2
and then in the line "CountVehicles=161"
you need 2 put the number of cars that u have or to make it easier go to the last car u added and copy the Car ID and remplaze 161 .... PD: if u need more help just tell me