How do I make it so that a tool that players create in the lobby can be used when the game starts?

Basically, I have no idea how this would work. Some context is basically I'm making a racing game where players create there own car in the intermissions but I don't know how to get the car they create to be usable when the players are teleported to the race map and when the race starts.

Any help would be GREATLY appreciated. Thanks!