Multiple game CDs to 1 DVD guide?

[Kyle2k]

Hi everybody (sorry for my bad english)

i want to create dvd games from multiple game CDs in order to save storage space.
some games fit well in a single dvd, when you simply copy all the contents of the multiple CDs to one temp dir in your hdd. this is the case when you have only .cab files to add in your TEMP folder (the only trick maybe is the dvd volume name, or editing .msi files)
however, some other games cannot work this way, because:

1. the volume name is wrong, and the game setup asks for the correct volume to continue the install procedure (you cannot burn a single dvd with multiple volume names!)

2. or worse: there is a conflict with the contents of the CDs: duplicated files with different sizes, forcing me to choose witch one i want to put in the TEMP folder.

That is my problem, guys. I found this issue when i tryed to backup Emperor: Battle for Dune 4 CDs to one DVD: the files does not match.

My question is: is there a guide or something explaining how to solve this issue? i want badly to backup this game to a single dvd (and a few more)

thanks for your help
Kyle2k