Hi, I think I have understood what you are trying to accomplish.
However, your process is probably meaningful in your case but it's by no means
standard in terms of logistics. That's why you will have to bend your process a bit,
or maybe bend SAP a bit.
As far as I can see, your requirement is to create an outbound delivery, pick and pack to HU,
which is done by standard to
Some ways that cross my mind to solve the issue are two step picking or maybe even
cross-docking but you would need to have more deliveries e.g. plant to plant inbound, to
cross-dock it to your outbound. But these are all possible workarounds, SAP didn't engineer
the processes in LE to match this type of requirements.
I don't think you will get the definite solution here, but more like ideas on which you will need
to explore and try to understand what SAP can do, and find out which of those functionality you
can use to fulfill your requirements.
There might also be someone who has already done a similar thing and would maybe even get
you up and running with a complete detailed solution if you are lucky.
If you need more help, feel free to ask.