YES there are possibilities to share some extension.
But you may encounter some limitations.
It is theorically possible to know which site ID is working.
To attach this information to the VirtueMart, this probably require additional development in virtuemart to save this information.
So that would require customisation of VirtueMart to save this info.
The "Articles Sharing for JMS" allows to share articles from any websites and you can also create you own article in your own slave sites.
If you need that we assist you in the configuration of you environment, this is possible with our billable support that you can find at
www.jms2win.com/download?page=shop.produ...35&category_id=1