How do I move an issue from one sub task type to another, and keep the parent relationship?

Danielle Green_1lthiv

I've been handed some Jira projects which historically have used sub-tasks in an interesting way - having different sub-task types as children of a story. For example, UAT sub-task, development sub-task, spike sub-task etc. 

The origanization approach is now to use only one sub-task type (Sub-Task). There are thousands of these orginal sub-tasks which I need to transition to this one Sub-Task issue type. How can I do this as a bulk edit and keep the parent-child relationship?

ie Story->UAT-sub-task should be Story->Sub-Task. With thousands of issues.

It is not an option to rename the different sub-task types!

Thank you

Anna Henke_qic1am

See Sirko Mantheys answer in this thread - this just saved us: https://community.atlassian.com/t5/Jira-questions/Bulk-move-subtasks-to-new-type-WITHOUT-changing-the-parent/qaq-p/1133655