Hi,
Thanks for using our plugins. I can help out here.
We currently have no features for a master or global stock per event.
However, that is a feature of 4.1, which we are working to have release in the middle or later part of this month.
I believe we will have the release candidates out soon that you could start using to test if it will work for you.
That will be available in your account downloads once it is ready.
Let me know if you have any follow up questions.
Thanks