What you are asking about is called "Authoring" Nero CAN'T perform this function it can only burn to DVD. You need something like Ulead DVD Factory or Ulead DVD Workshop. HomerJ
I use Ulead and it works fine, when I get home I'll pop the 30 day trial url, if u like it buy it! or do wot ever u do with it after ya times up, just make sure u have more than 12gb freee....otherwise it wont work!! ... Good luck