You can try from the warehosue monitor level.
From the outbound document you can use the process code for adjusting the delivery quantities and close (or create the new delivery for the differences if you would like to):
For more deliveries you can use the same method but from warehouse monitor.
Please go the "more method" button to call the process code and select the option which you want to use:
Hello Abhishek B,
Please refer below SAP thread and blog. Might be it's helps to you.
Please confirm if it's works for you.