Associating multiple PO's to a Trade Operation in Landed Cost

Summary:

Multiple PO line items are loaded into a container and the freight needs to be allocated across these PO's

Content (required):

From the Trade Operation UI it was not possible to associate multiple Po's at the same time. In such scenario where on e container freight needs to be allocated to multiple PO's how can this be done?

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Code Snippet (add any code snippets that support your topic, if applicable):