DVD Multi-boot of Vista SP1 a 64 bit

HI

Having created a DVD of Vista Ultimate SP1 64-bit Retail including six
editions of Vista, I would need to insert in the DVD six files
autounattend.xml to create six fully automated installations
(including the partitioning of the hard-disk).

In practice, when I make the boot from this DVD, it must now appear a
menu where you can choose which edition of vista install.

I have read that with the syntax "setup.exe /unattend: <Unattend
file>", you can tell the setup of Vista using certain unattend file,
stored on the DVD of Vista, in order to perform different unattended
installations according to the unattend file chosen.

Then, just need a way to bring up a menu of choice to start of the
installation of Vista so you can choose which run unattend file. So,
how do you do this?

Someone has other ideas to solve this problem?

THANKS

BYE