How to get gta online vehicles in single player?

The only source of information available about Grand Theft Auto Online is its description as an online multiplayer component of Grand Theft Auto V. That description does not mention any method for moving vehicles from the online mode into the single‑player campaign. Therefore, based on the evidence at hand, there is no known or officially supported way to acquire GTA Online vehicles within single‑player gameplay. Players who wish to change or add vehicles would need to look outside of this documented information, such as unofficial tools or mods, but those are not covered by the verified sources.