Exporting Custom Fields

I have custom fields added to my CS Cart but unfortunately these fields are not available to me when I want to export data. These custom fields are in the checkout page under Billing & Delivery details. When I export all the delivery addresses, I can't add these custom fields so I have to manually enter them in Excel.

Can anyone help?

You should use the Extra fields field to export additional profile fields

http://prntscr.com/ensu3f