In Grand Theft Auto 5 Online, you can make a stolen car your own by stealing it and then selling it to the player. This is done by finding a car in the game’s online garage and stealing it, then selling it to the player. The process of stealing a car and selling it to the player is as follows:

  1. Open up GTA Online and find a car in the online garage.
  2. Steal the car and sell it to the player.
  3. Make sure that you have enough money to buy back the car once it’s sold to you.