First step:
You have to rent a money-van. To rent a money-van, use /gps > choose money-van rental > go to the red marker > get in a money-van and rent it (/rentcar - it costs $100.000 to rent one).
Second step:
After renting a money-van, go to the business and load the money (/loadmoney) with the money-van.
Third step:
After loading the money, go to a bank (/bank) and stand in front of the door with the money-van to unload the money (/unloadmoney).
Notes:
(1) You must (be the owner of the business/have the key along with permission to unload the tills) to be able to unload the business' tills.