For users wanting to update Product Bin Locations in bulk, there is not a utility to do this but a quick way to do this is to import in the Bin Locations.
Under Admin \ Manage Import Routines, you can set up an import to bring in Product Location Data
Code, location and the bin location. These are the minimum three columns you would need to import.
See Importing Data from the Admin / Import Data Menu for further instructions.
Bin locations can also be updated using the Auto Order by Sales feature