Hello developers,
Advanced Shipment by Kainhofer (open source) is a great addition to VM:
http://dev.virtuemart.net/projects/virtuemart/repository/revisions/10786
So is Advanced Ordernumbers - https://open-tools.net/virtuemart/advanced-ordernumbers.html .
I have been using them for few years now, and they're great!
Cheers!