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Add a second Issue type to an existing hierarchy level

Drew Watson_1cqt2o

In Settings-> Issues -> Issue Type Hierarchy

I currently have a hierarchy of:

- Programme

- Initiative

- Epics

- Story (and all other standard types)

- Sub Task

I want to add a second issue type at the same level at initiative:

- Programme

- Initiative, Milestone

- Epics

- Story (and all other standard types)

- Sub Task

I'm hoping I can use it (Milestone) on Advanced Roadmaps to show major milestones like Customer deadlines.

My concern is that when I try to add it to the hierarchy I get this message:

"Are you sure you want to change the hierarchy configuration?

Moving or changing hierarchy levels of issue types will break existing parent links in all company-managed projects in your site. This change can't be reversed."

I'm not inserting a new hierarchy level so I can't see an issue - but I also don't trust Jira not to just drop all the links between the Epics and Initiatives across the entire company...