I'm creating my first Advanced Roadmap, and I'd like to relate the Epics and Master Epics in my plan across several projects to a common L1 Business Process. I have been through the documentation and it tells you how to create a hierarchy level, but not how to relate an Epic to a level of the hierarchy. Or do Epics need to be related only to Master Epics, if that level exists in the hierarchy? And if that's the case, I don't see any opportunity to make that relationship, either. I've only ever seen an Epic Link that relates a Story to and Epic.
Thanks!