DVD Studio Pro 1.5: How to Create a Track

Tracks are sets of video, audio, and subtitle files along with markers, angles, and stories. Tracks can be linked to buttons, scripts, menus, slideshows, and other tracks.

Click the Assets tab in the Project View to access the Assets container.
Drag one or more video assets from the Assets container to the Graphical View.

A green track tile for each asset you dragged appears in the Graphical View. If you created multiple tracks and only see one, drag that track tile. The others may be underneath it.

To create an empty track, click the Add Track button in the Graphical View. Use the Property Inspector to assign video assets, "Jump when finished" actions, and other properties.