A sub-task issue is typically one of many tasks that make up a story (or parent issue).
To create a sub-task:
Click the Agile link's down-arrow in the top navigation bar, then select your preferred board from the resulting dropdown menu.
- If you are using Scrum and the issue is currently in the planning phase, click Plan; otherwise click Work.
- Locate the parent issue (story) for your new sub-task, and click its issue key (or type t in Work mode) to display the Issue Detail View on the right-hand side of the screen
- Click the sub-tasks icon:
- Click Create Sub-Task.
- Enter your sub-task's details into the Create Issue dialog box (see Creating an Issue).