For locations each user can be set to be restricted to a specific location. Go to Edit/Users/General.
Then when the user logs in there will be a dialog for which location to use. If they are restricted then they will only be able to log into the one they are assigned to.
Add a GL account using the location segment for each account the company wants to re-direct. At minimum the company usually sets a sales account for each location, but can also add coast of goods, inventory and taxes.
Video Instruction – Location Accounting