I want to convert "story" to "epic" so that I can convert the "subtasks" to "tasks" so that I can assign the tasks to different sprints.

I find I have to do alot of clicking to make this happen:

1. select the subtask
2. more -> convert to issue
3. select "task"
4. click 3 times
5. click "edit"
6. Assign the "epic link"

Now do this for all the 20 other subtasks. It would be better if I could do this with fewer clicks.