A global list definition is not exported with a process definition. You have to consider a global list like a database table when you manage multiple environments (dev, staging, prod)
It means that when you export a process definition from development to production, you have to check if the global lists used by the web form are already in production too.
To deploy a global list from dev to prod, WorkflowGen administrators just have to export the global list (XML file) and import it in the production server.
Then you can, if needed, change the global list settings and content for a production usage (like the databinding settings).
To manage multiple versions of a global list, you have to duplicate the global list and rename the new list (e.g: MYLIST_V2).