Sales Order to Customer A, Reserve Invoice to Customer B (Delivery Consolidation)

Hello,

I have send an sales order to Customer A.

He orders the product, but he doesn't want to buy it, because he want's to lease it via a Leasing Company. The Leasing Company Needs the Invoice as Reserve Invoice, because the first have to pay the Money, before we order the Product. How can create the Reserve Invoice (with Adress and Customer Number of the Leasing Company) from an Sales Order (with Adress and Customer Number of the Customer A)