Run PPT2DVD program, then the wizard screen appears as below to let you start with a new project:

Click Browse... to locate multiple presentations and import them to your project. To eliminate an unwanted presentation in the list, select it in the title field and then click Remove.
Tips:
1. You don't need to import the audio/video/flash linked to your presentation, all of them will be saved after Conversion.
2. You may import up to 9 files for conversion at a time.

3. Make sure the hard disk of Output Folder and Temporary Folder have more than 2GB free space