The requirements hierarchy lets you quickly identify which requirements have been associated as parent and child. The list shows in order by parent with the children below the parent.
Follow these steps:
From this list, you can perform the following tasks:
A gray arrow indicates a collapsed hierarchy with the children hidden. A black arrow indicates an expanded parent with the children listed. In the following illustration, the expanded hierarchy has four levels. You can create an unlimited number of levels in a hierarchy.

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