Re: how to Re Assign existing HU to new OB Delivery

First of all he can not delete the Outbound delivery without removing handling units from the delivery.Once TO confirmed then Handling units will get assign to the delivery.In your case TO not confirmed so no handling in the delivery.

Check the HU currently where is located in your warehouse .Use the transaction LT24.

Create the Another Outbound  delivery then create the Transfer Order.