Thanks for your interest in Aspose.Slides.
I regret to share that desired functionality is unfortunately unavailable in Aspose.Slides at the moment. Actually, this feature has been introduced in PowerPoint 2010 and its implementation in Aspose.Slides has not yet been done. However, an issue with ID 26375 has already been added in our issue tracking system as new feature request to investigate the possibility of this feature. We will share further information with you as soon the feature is available.
We are sorry for your inconvenience,