In your admin dashboard, click on the Settings menu to the top right of the page to reveal a drop-down menu. Next, click on the Delivery Settings option and a Delivery Settings form with four tabs (FieldsReasons, NotesPOD and Notify URL) will be shown.

Under the Fields tab, you can customize the headers under the Customized Header field (second column). If the Customized Header field is left empty, the Default field (first column) will be used. This can be very useful if you are exporting your manifest from your existing system or your manifest file already comes with its own set of headers.

You can visit our tutorial site on How To Customize Import / Export Headers For Deliveries.