To create a new movie, click the button at the top of the Project Tree window, or right-click the root of the movie tree, "Movies":

A window will pop up:

Name - the name of the movie.
Group - the group the new movie is added to. A group lets you change the audio track or the subtitles of several clips at once (as long as they are in the same group). By default a new group is suggested for each new movie, but you can place them all into a single group. When you change the current audio track or subtitles in the menu, they change for all movies and playlists of the group.
Autorename - automatically use the name of the movie as the name of the group.
Another way to create a new movie is to drag and drop a video from the Library onto the root of the movie tree, "Movies".
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