Main toolbar > Curve Editor (Open) > Expand tracks on an object with animated vertices or vectors in the Track View hierarchy.
> Master Point Controller
Graph Editors > Track View – Curve Editor > Open Track View > Expand tracks on an object with animated vertices or vectors
in the Track View hierarchy. > Master Point Controller
The Master Point controller is assigned automatically whenever control points, vertices, or vectors (tangent handles) are animated in the sub-object mode of an Editable Spline, Editable Patch, Editable Mesh, Editable Poly, NURBS surface, or FFD. By allowing you to select and move all the sub keys, visually correlate keys to points in the viewports, and change key properties quickly, this controller helps to manage the numerous tracks created when animating vertices, control points, and vectors.
The Master Point controller is displayed as a track with green keys in Track View. Sub tracks below the Master track contain all the animated vertices, control points, and vectors.
Example: To animate vertices, viewing the Master Point controller track:
Right-click the sphere and select Convert to Editable Mesh in the dialog.
On the Editable Mesh > Soft Selection rollout, click Use Soft Selection.
In the viewports, select and move some vertices on the sphere.
Right-click the sphere, and select Curve Editor in the dialog.
Track View — Curve Editor is displayed with the sphere at the top of the Controller window.
Change modes to Dope Sheet and expand all the sphere tracks in the Track View hierarchy.
The Master Point Controller track is displayed, with tracks for the animated vertices below it.

Master Track Keys—While in the Track View – Dope Sheet, selecting a master key (green) selects all the sub keys at that frame.
If hundreds of vertices are animated, collapse the master track so that only the master track is visible. Moving the green keys will move all the sub keys.
Right-click a green master key in Track View to display the Master Track Key Info dialog.