A feature tree is a way to look at planned product features hierarchically, so you can quickly understand the relationships among product features you have specified.
A feature tree is what you see when you click the Tree button on a tracker overview screen. (You can return to the traditional single-level tracker view by clicking list.)
The feature tree shows you the nested descendants of an artifact at whatever level of detail you need, all the way down to the tasks supporting your lowest-level user stories. When you define a user story that depends on several tasks for its completion, and you declare each of those tasks a "child" of the user story, they appear as subordinate nodes under the "parent" user story artifact in the feature tree.
User stories are the most common components of a feature tree, but any kind of artifact can appear. For example, when the completion of a user story depends on fixing a bug, the artifact representing the bug appears in your feature tree as a "child" node under the artifact representing the user story.
For each artifact in the feature tree, look for this key information: