Split invoice payment between supplier and third party

Summary:

Is it possible to split the payment of an invoice between the supplier and a third party?

Content (required):

Our client has a need to be able to partially pay an invoice to the supplier and the other portion to a third party. From what I see the third party is setup at the supplier level, so all invoices would be paid to this 3rd party. I'm looking for a way to indicate who to pay for specific invoices of a supplier.

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