How Can I Avoid Duplicate Epics in Shared Projects?

[Gina Nace]

We deal with extremely large scale projects. Our top level is really an initiative and we have several sub projects feeding into it. I have one board that pulls in all the sub projects. However, some sub projects have the same epics. Is there anyway to avoid having duplicate epics within my main board? Is there a better way to set this up? Any insight is appreciated, thanks!