Scanning of HU & issuing only those loaded

Can someone help me with the below mentioned scenario

I have assigned all Handling units to different outbound delivery. I now require to scan the HU from each of the Outbound delivery. After scanning, only those that are loaded need to be posted 'goods issue'. Can i get some help on this pls.

Also from the end-user point of view, if i split all (for eg 10 outbound deliveries), how do i recollect which outbound delivery i need to post goods issue.

Kindly give me your feedback. Would be very appreciative of it.