Editing Clips and Selections : Editing Stereo Tracks : Dragging Clips to and from Stereo and Multichannel Tracks
 
Dragging Clips to and from Stereo and Multichannel Tracks
Dragging a stereo clip to two mono audio tracks
When dragging clips to or from stereo tracks, the following rules apply:
Provided the number of tracks and channels are the same for the source and destination, you can drag clips between stereo tracks and mono tracks.
When dragging stereo clips to mono tracks, the destination tracks must be adjacent.
When dragging clips from mono tracks to a stereo track, the source tracks need not be adjacent.
Stereo clips can also be dragged from the Clips List, to stereo tracks of the same format or a pair of mono audio tracks.
Conversely, pairs of single, mono clips can be dragged from the Clips List to stereo tracks.