PS2 DVD Editing, Nero

[burnmp3s]

Hi, I just started with DVD PS2 games, and so far the only burning software I have is Nero. So far I've only done straight DVD to DVD copying. I would like to be able to save the dvd to my HD, edit some of the files (I want to change the music, and I have the software to convert PS2 music files to regular music files) and then burn it on to a blank DVD. Does anyone know how to do this with Nero? Thanks in advance.