Partially Refund UNFULFILLED orders

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I'm wanting to refund my customers who have pre-ordered my product for the amount of 15% of what they paid, however I have not yet fulfilled their order, due to waiting on the stock to arrive. 

Can you advise how I am able to refund a partial amount, without removing their line item (I've tried selecting 'Do not Restock', but it then removes the option to "Create Shipping Label"). 

Many thanks,