It would be nice to have the option for using existing outlines or having a new one.

For example, I am a school teacher and I wish to keep my tasks for my different classes separate. When I add a new board and select to view an Outline pane, I am greeted with the Outline pane I have already populated. I would prefer to have a fresh one for each board so that I am not distracted by all of the other things on my list.