how to group epics, projects under one initiative

[Maro Hamamjyan]

we checked below documentation

https://confluence.atlassian.com/jiraportfolioserver/configuring-initiatives-and-other-hierarchy-levels-802170489.html

we created initiative issue type in both jira and jira for portfolio

and could not figure out how to group multiple epics to one initiative. We would like to have initiative on parent level followed by projects and epics