Recently next-gen projects have enabled subtasks as an issue type available for use. While you can now create subtasks, there is no mechanism within Next-gen to convert subtasks into Stories NOR is there a way to convert existing stories / tasks into a subtask issue type.
It would help to have the option to
- Convert To Subtask
- Convert subtask to Story (or other standard issue type)
The inability to convert such issue types makes it really tedious to recreate issues. Sometimes a subtask becomes more complex of an issue and in turn is deserving to be it's own issue outside the bounds of that parent Story.
In next gen you have to recreate the entire issue as a type of story, whereas in Classic projects, you can just use the convert option in the ... or More menu in order change this issue type without having to create the issue.