System information
2.  Right-click one of the tracks, choose  Track Group, and  then choose Group Selected  Tracks.
The tracks are grouped together. Click the Collapse/Expand   Track Group button in the track group 
header to close and expand  the tracks in the group.
When a track group is collapsed, dark gray bars indicate the length  and location of events in the 
collapsed tracks.
If you select a parent or child video track to be added to a  track group, all associated parent/child 
tracks will also be added to  the group to preserve the compositing  relationship. For more information, 
see "Compositing and Masks" on page 385.
When you collapse a track group, tracks and events in the group  are not locked. Edits made elsewhere 
in the project may affect tracks  and events in the collapsed group.
Adding tracks to existing track groups
Drag one or more tracks into a track group to add the selected  tracks to the group.
Removing tracks from groups
Drag one or more tracks out of a track group to remove the  selected tracks from the group. You can also 
right-click one or more selected  tracks in a group, choose Track  Group, and then choose Ungroup  Selected 
Tracks to remove tracks from a group.
Clearing track groups
1.  Click the track group header to select  all tracks in the group.
2.  Right-click the track group header  and choose Ungroup Selected  Tracks to ungroup all tracks in the 
group.
You can also right-click the track grouping lane and choose Ungroup Selected Tracks      from 
the shortcut menu to clear the track group.
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