If you need to make multiple assignments, rather than going into each agency individually it can be completed through an import.
For the import to work correctly, it must follow the specific template shown for the required columns in the spreadsheet:
Click on the template link to generate the required spreadsheet formatting:
You will see there are four required columns shown below that must be filled in for the import to function correctly.
After you have filled out the desired information on the spreadsheet, save it and choose that file on the import screen within RPM: