How to add new exporting field

Where is the data stored in the WordPress database? Is it in a custom field called wcj_purchase_price?

It would be helpful to see the data your are trying to export. If you like, you can create a testing server and send the login credentials to our support team.

Testing server: https://www.wpallimport.com/debug/
Support: https://www.wpallimport.com/support/