Our portfolio items hierarchy is Initiative > Epic > Feature, with User Stories associated with Features. My users want a view that shows all user stories in an iteration associated with a specific Epic. I can filter the Iteration Tracking view by Feature, but not by Epic, which is one level above. I can filter Portfolio Items by Epic, but can't then filter to show only stories in a certain Iteration. I tried using a custom list but would need to be able to filter by grandparent in order to do this. Any suggestions?