Returns process after partial confirmation of goods delivery.

Hello All,

We have POD activated. done with all config and works fine.Image may be NSFW.
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I have a process related question.

Scenario: when a customer confirms partial quantity of goods PGI'ed ( PGI'ed qty 5 and confirmed qty 3) and we carry out POD (using VLPOD) for those 3 qtys and invoice the customer for 3 qty,

Problem:

1. Now how can we get the 2 qty back into our stock?? should we follow normal returns process with custom item cat in return order, which is not relevant for billing?? as customer hasn't made payment for those 2 qtys.Image may be NSFW.
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Regards

Naveen