Need to populate PO Line level DFF from EDI 855 Payload. Customer needs to capture details in Line l

EDI-855 Need to populate PO Line level DFF from EDI 855 Payload. Customer needs to capture details in Line level DFF.

While they get the PO Acknowledgement via EDI 855. DFF is not available in the seeded Payload and we would like to capture few details in PO DFF from Payload Like Backorder Quantity.