Editing : Making Selections : Selecting Track Material : Selecting Across Multiple Tracks

Selecting Across Multiple Tracks
To perform edits across multiple tracks or all tracks, you must first select the tracks. Do this by including other tracks in the selection, or by selecting in a Timebase ruler (for all tracks).
To make a selection in multiple tracks:
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With the Selector tool, drag vertically to include adjacent tracks in a selection (drag horizontally to define the time range).
To extend a selection to another track:
1 Using the Selector or Time Grabber tool, make a selection in the first track or tracks.
2 Shift-click in additional tracks with the Selector tool. An identical range is selected for each additional track.
To shorten or lengthen the selection across each of the tracks, press Shift while dragging to change the range of the selection.
To select across all tracks, do one of the following:
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Enable the All Edit Group and make a selection in any track.
– or – 
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Drag with the Selector tool in any Timebase ruler (make sure the Timeline and Edit Selections are linked).
These selections include all tracks in the Edit window, but do not include the Conductor tracks (for Tempo, Meter, and Markers).
To select across all tracks, including the Conductor tracks (for Tempo, Meter, and Markers):
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Alt-drag (Windows) or Option-drag (Mac) with the Selector tool in any Timebase ruler.