Time, Tempo, and Meter : Move Song Start : Move Song Start Options
 
Move Song Start Options
Options for the Move Song Start command include:
Timebase
Lets you precisely redefine the position of the Song Start Marker.
Move Start To
Sets the location for the Song Start Marker in the selected timebase.
Renumber Song Start To
When enabled, this lets you set the Song Start Marker to any bar number.