On the main menu, click File > Maintenance > User Defined > Extra Fields.
If the Extra Field contains information somewhere on your database we strong recommend to make the Extra Field Inactive instead of deleting it.
In the Extra Fields window, to select the field to delete, click the blue margin cell next to the field. The row appears selected.
Press the [Delete] key on our keyboard. You are prompted with the following message.
5. If you are sure you want to delete click OK on the message above. The field is delete.
6. When you have finished, click to save the changes and close the window.