Advanced Roadmaps Jira Cloud - Two issue types at the same hierarchy level

[Pablo Bernardo]

In Jira Advanced Roadmaps, I would like to understand if it is possible for us to introduce two issue types to be in the same of hierarchy.

Context: 

Some projects in the company are using an issue type called Initiative and Epics, tasks, etc go under that one. But, because of fields configurations, we would like in other projects to be able to have a different issue type but still make it sit in Jira Advanced Roadmaps at the same level as "Initiative".

Meaning, Epics, tasks and so on could go either under "Initiative" or "Whatever other name".

Is this currently possible?

[Pablo Bernardo · Accepted solution]

I am answering myself because we found the way, in case someone else did not realize this is possible.

It is not only possible but actually the native behavior.
The issue type selector is a multi-select field.