I understand Greenhopper provides the functionality of creating Agile board with multiple projects. That's great. Based on that I can prioritise backlog on higher level than individual teams and projects.
I can slice sprints based on the priority and velocity of invidual teams. So for instance for project A and B, 3 Scrum teams are working. Depending on the team comfort and velocity sprints are sliced for individual teams.
Now based on the past velocity of teams working in this mode, I would like to get the velocity graph. I don't see how to do that as there seem to be no correlation between sprints and teams. Sprints can have relation with project but not with teams.
Any idea on how to acheive the same.