When you're in the main editing screen of Movie Edit Pro, you will see a drop-down list below your preview monitor, which basically lists all the movies in your current project. Usually, this will just be one single movie, but the program has the possibility to contain more than just one movie within one project and thus burn more than one movie onto a single DVD (provided they're short enough to fit on there). If you click on that drop-down list to open it or if you go to the "File" menu, you have the option to create a "new movie" or to load a movie. If you do that, the program will prompt you whether you want to close the movie you had been working on and replace it with the new movie or whether you want to switch to multi-movie mode. Make sure to pick "Don't close". The program will switch to multi-movie mode and you will be able to edit another movie in a new timeline within the same project. You can add further movies this way. You won't be prompted regarding the mode again, since you're already in multi-movie mode. You can switch between the movies in the drop-down list below the preview monitor. When you're done editing and you switch to the DVD authoring stage to put together your disc, you will see that there are several entries in your main DVD menu - one for each movie. (They're possibly spread out over several pages of the menu though, depending on the number of movies and settings of the menu.)