Freight & Tariff - How to import PO matched invoices using EDI810

We are R12.1.3 currently . We have EDI810 implemented for few vendors and most of them are PO matched invoices. We currently have a way to import freight lines for non PO invoices, but so far none of the PO matched vendors are sending any freight amounts. With the introduction of tariffs in US, some of the vendors are planning to add the same to the EDI invoice.

Please advise how do we import these addl lines, Freight / Tariff etc thru EDI and how can they be matched to the PO without any issue.

Thanks

Raghu