Multiple Install Images on a single disk

Greetings All:

I have set up a USB Thumb Drive for installation of SUSE, as well as booting some other tools.
The drive uses GRUB legacy, and EXT4 formatting.

To set up SUSE for installation, I copied the entire contents of the Install DVD to the Thumb drive (in the ‘/’ directory) and
pointed the GRUB menu to the initrd and kernel.

This setup works great for installing a SINGLE level/version of SUSE. However, I would like to be able to install different versions
(32 bit, 64 bit, Beta, etc) of SUSE from the same drive. In order to do this, each version would need to be placed in a separate
sub-directory, and somehow let the installation know where to find the files. Is this possible?

Thanx in advance.