Use the following methods for editing ranges:
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.
To drag the ranges of an object and all of its linked descendants:
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.