At this point it's not a "create" it's more of a "move" existing tasks under the existing user stories under the Epic. With this default hierarchy you can't make an issue a "child" of another issue at the same level. So in this case you couldn't make a Task a "child" (under) a Story. You would have to convert the Task to a Sub-task, and then
Answer accepted. Update the custom field id. Add this script in the story workflow, in the transition to the last status. This is based on the status category, if all the child stories are in a green status, then the date field will update on the epic. Checked the script , seems to do the job.
When label changes for an epic issue type, copy the values to the child issues (story/task/bug issue types) When label changes for a child issue type, copy the values to the grandchildren (subtask issue types) Rule #1 can trigger rule #2, so in the detail settings for Rule #2 you may enable the "Allow Rule Trigger" option to make this work. Like.
Covrting a sub-task into a child-issue of same epic. I have an epic that has child issues and sub-task. Need to move all the sub-tasks as a child issue. All the issues should appear as a child issue and the issue type should be a story. The project is in a company-managed setting.

On the General tab near the bottom select "Use Ranking". Now your epics should stay when you move them in the quick filter. I was able to drap and drop on the ROADMAP screen, and the changes seem to be carried over to the BOARD. Go to configure your board. On the General tab near the bottom select "Use Ranking".

How to adjust or change duration of a task under an epic in the timeline. When creating a time line, jira provides editing or changing the time of the Epics. but when a child issue is added to a relevant epic in the timeline, jira does not allow to change the time. it is automatically set to the sprint time line which the issue is included. 2H0oUCB. 88 99 476 189 242 1 470 381 406

jira change epic to task