To add tracks to a segment
If necessary, open the editing window for the segment.
On the Edit menu, click Add Track(s).
- or -
Right-click the Segment Designer window anywhere other than in the timeline, and then click Add Track(s) on the shortcut menu.
In the Add New Tracks dialog box, select one or more track types.
Click OK. A new track is inserted into the segment for each track type you selected.