Expose more of the Portfolio Management features in this list

doc/topics/plan_and_track.md

@@ -40,4 +40,7 @@ Get work done as a team.
 Align your work across teams.
 
 - [Epics](../user/group/epics/index.md)
+  - [Multi-level epics](../user/group/epics/manage_epics.md#multi-level-child-epics)
+  - [Epic boards](../user/group/epics/epic_boards.md)
+  - [View heath status](../user/project/issues/managing_issues.md#health-status)
 - [Roadmaps](../user/group/roadmap/index.md)