Customization → Types Setup → Work Hierarchy → Adding a work hierarchy
A work hierarchy is a defined relationship between work types. There are four default work types: defects, epics, tasks, and stories. You can add custom work types. A work hierarchy can be defined to use any combination of default and custom work types. Each work type in the work hierarchy can be defined independently, including whether it can exist at the top of the hierarchy (without a parent), whether it can be assigned to an item type, such as a team, and what it's possible parent and child work types can be. As you are adding a work hierarchy, you can view the relationships on the right side of the Work Hierarchy tab in the Types Setup view.
To add a work hierarchy
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