We have Jira Premium on the cloud and I have set up a Top Level planning project which hosts the top 2 hierachy levels. We then pull in the epics for several other projects. I created some on the Initiatives on the plan view and some on the proect view (may or may not bereleavant)
The issue is that on the plan basic view some initiatives have a timeline that reflects a roll-up of all child issues and some don't!
