Hello!
We tested in system and found currently it is not supported to create multiple inbound deliveries for one customer return notification.
In post goods receipt screen, the "Remove" option for line items is grayed out so you can't remove the line. And if you maintain 0 quantity or less quantity than notified quantity for the product, you will not be able to create a second inbound delivery for the same notification.
As a workaround, you can split customer return notification, and create one inbound delivery notification for each of them.
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