JamesLQ1

i need some help trying to add in a place to be like a 3rd fire station i noticed in the LA mod 2.1 that there are polys where the apparatus spawn so i figured out how to drop a building to be like a station but i cant figure out how to make the polys work like a parking place in a station if someone could help please let me know as i am trying to make an East Coast Canadian mod with units from my RL City