If you have a CSV file with people you'd like to import, the Organization Administrators can import all the people at once instead of adding each person individually. There is a button within Services for this, but it will take you to the People app to complete the import.
Click CSV Import
From the top of the People tab in Services, click the settings gear and select 'CSV Import'. This will take you to the People app to complete the import. Click here to visit that lesson for how to proceed with the import.