Not able to Prorate One LCM charge across 3 Receipts form 3 Purchases Order in Invoice

Dear All,

Basically we have a scenario where we have one shipment for 3 purchase orders from different supplier and they all are process through one LCM charge line (i.e. Custom Clearance).

Currently what we have done is we matched actual PO invoices to 3 receipts which belong to 3 POs. But we want to match actual LCM charges to these 3 receipts so that the amount gets properly distributed across the 3 receipts.

Can anybody share the possible ways to handle the scenario to book these invoices which get prorate properly based on the total amount of LCM charge line (i.e. Custom Clearance) across the 3 receipts items.