Exchange - retain channel order ID

Retain the channel order ID when processing an exchange.

We generally need the channel order ID to identify an order in our customer service.

As it stands, my options are to either exchange the order and lose the channel order ID, or to return and clone the initial order. This can be inefficient for orders on many units/SKUs.

Offering an option when clicking 'exchange' in an order to retain or delete the channel order ID could be suitable.