As a default behavior, whatever biped part is selected in the viewport will have its curves displayed in the Curve view. You can also use the to select biped parts by name. The functionality of the Select panel is derived from the ; you can invert the selection set or enter a name into the Selection field to find a track.
The Workbench toolbar lets you choose the type of curve to display and the coordinate space in which it is displayed. For example, if you know you are dealing with rotational errors, choose an Rot or Quat type curve. If it is an error of positional data, choose Pos.
If you open the Track View – Curve Editor or expand the track bar while you have the Workbench open, you will see a simultaneous display. The views are all synchronized, so selecting a track in one graph editor selects it in all.