Recently a method has been found on how to get unlimited money in GTA 5 Online after the 1.14 Hipster Update/Patch! This is an exploit that Rockstar missed in the game that allows you to duplicate and then your car in GTA V Online.
You will need another person to aid you in the process of this glitch, a garage, a car you do not care for, and a car you would like to sell for a heaping amount of money. For some reason I tried this glitch with the Zentorno however it did not allow me to sell the duplicated car, but I tried it with the OBEY 9F and it worked perfect.
SOME TUTORIALS HAVE THE METHOD OF PUSHING A TOOL BOX HOWEVER THIS METHOD IS FAR MORE SIMPLE AND EASIER