I'm currently using this filter to show all Epics and Stories under a feature but I need to show all subtasks also. This filter does not display subtasks but I need to modify it so that it does:
(PMO-21236 is the Feature)
project = KCIAPPS AND issuefunction in portfolioChildrenOf("Key = PMO-21236") OR issueFunction in issuesInEpics("\"Parent Link\" = PMO-21236") ORDER BY Rank ASC