Noob Question: Can you extract specific sections

Hi, I was waiting as were many for clonedvd before I purchased a dvd burner. Seems I shouldnt have waited for it since most impressions of it are poor. Now to my question: Is is possible extract only those scenes you want from different DVD’s and then reassemble them as a favorite horror scenes DVD for example? If you can I assume you would know exactly what part your extracting via a preview window of some sort. That is what I am interested in doing besides directly backing up some home DVD movies and backing up files etc. thanks