I talk for the step for save dupe, you can't save them
To register :
You have to put the back of your mok against a wall.
So as not to have a sinematic crisis.
9.
Once you have placed your MOK you will find the car you would like duplicated and you make right arrow.
10
It will be necessary that...
you can't sell normal vehicles but benny's you can ^^ tested with izzy full custom (1M) or elegy retro custom (~1M) you can sell it after restart the game or simply go offline and go online