2 movies on 1 DVD-r selectable with NERO?

Does anyone know if there is a way to have 2 DVD movies on 1 DVD-R (using CloneDVD)? I read somewhere on this site that you can make a menu with NEROVision Express allowing you to select from different movies you want to watch. I’d rather not use another program for re-encoding movies so can anyone please tell me if they know how its done or a guide. Just for info, I use DVD Decrypter to decrypt the DVD then CloneDVD to re-encode then I burn with Nero.