1. Control > Import Center
2. Select the import category and the template
3. Select the .csv file to upload and then upload the file in Import Center for a preview
4. Select an Identifier and Map fields in the import file with fields in Sphere, and also select the field that will be used to identify the records in the file (for example, Supporter ID)
5. Click Next
6. Check the box to overwrite existing data
7. Specify how Sphere is to handle records that already exist in the database
8. Specify whether you are to be notified when the file is validated, and how Sphere should proceed if it encounters errors for records in the import file
9. Specify a name for the import file, and then submit the import for processing
10. Complete the Import