Edit Ranges displays all tracks as range bars. This mode is useful for quickly scaling and sliding complete animation tracks.
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Track View > Dope Sheet Introduction > Keys Toolbar > (Edit Ranges)
Use the following methods for editing ranges:
- To change all animation in a track, drag the range bar of the track.
- To change all animation in multiple tracks, drag range bars in higher-level tracks.
- To change a track bar's length, drag its endpoint. In effect, this scales the timing of the track's animation.
Note: Access to individual key values is unavailable in this mode.
The Ranges toolbar contains additional tools for working with ranges. To open the toolbar, right-click an empty area adjacent to the Dope Sheet toolbar and choose Show Toolbars 
Ranges: Dope Sheet. After doing so, save your layout.
Procedures
To drag the ranges of an object and all of its linked descendants:
- On the Track View toolbar, click (Edit Ranges).
- On the Track View toolbar, click
(Modify Subtree). - In the Track View Key window, drag an Object range bar or the World range bar.
With Modify Subtree on, a range bar displays in the Objects track. The Objects branch is the default parent of all objects in the scene.
Dragging a parent-object range bar with Modify Subtree on affects all tracks subordinate to the object and all tracks of all of its linked descendants.