Time, Tempo, and Meter : Move Song Start : Move Song Start Options : Move
 
Move
The Move controls let you choose which items shift when the Song Start is moved, as follows:
Song Start Only
Moves the Song Start Marker only.
Meter and Tempo Rulers, all Tick-Based Markers and Tracks, and Sample-Based Markers and Tracks
Moves the Song Start Marker, events in the Meter and Tempo rulers, all tick-based markers and tracks, and your choice of all or no sample-based markers and tracks.