Site Administrators can create additional fields that can then be easily uploaded. Follow these steps to get your Custom Fields set up:
Navigate to Admin > Settings > Custom Fields
Choose User Custom Fields, Group Custom Fields, or Event Form Custom Fields
Click on Create Custom Field
Populate the form details to create the Custom Field
Once the Custom Field has been created, you will be able to upload data with a regular upload and add the name of the newly created Custom Field at the end of the template.
Please contact firstname.lastname@example.org with any questions.