how do we map Extrinsic fields to invoice DFF

Summary:

Please guide me to map Extrinsic fields in cXML invoice inbound files to map DFF columns.

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Example tags :-

<Extrinsic name="carrierName">PPI Test Mode Order - CARRIER_NAME</Extrinsic>

<Extrinsic name="carrierTrackingNumber">PPI Test Mode Order - CARRIER_TRACKING_NUMBER</Extrinsic>