I have an issue type called Bug and it is used in all of our JIRA projects.
I must be missing something and hoping someone can help.
Note that you will not be able to convert an issue to a sub-task if the issue has sub-tasks of its own. You will first need to convert the issue's sub-tasks to standalone issues (see below); you can then convert them to sub-tasks of another issue if you wish. Sub-tasks cannot be moved directly from one issue to another — you will need to convert them to standard issues, then to sub-tasks of their new parent issue.
This is quoted from the documentation of converting sub task, refer below for the documentation.
Hope this helps, cheers!
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