Tempo Track
You can use the tempo track to create tempo changes within a project.
To add a tempo track to your project, click Add Other Track or Use Track Preset in the global track controls area of the track list, and select Add Tempo Track.
You can use the tools on the Project window toolbar to add and edit tempo events.
You can use the tempo event editor to edit selected tempo events.
To select a tempo event, click it with the Object Selection tool.
To select multiple events, drag a selection rectangle with the Object Selection tool or Shift-click the events.
To select all tempo events on the tempo track, right-click the tempo track and select Select All Events from the context menu.