SUSE does not provide for a side by side install in its partition options during the install process.
That would really surprise me! Every version of Suse I have installed gave options. Are you using 'Manual' or 'Expert' option for the installation? If not, it is worth trying.
What option(s) do you get? Perhaps you could post the output of "fdisk -l" run as root so we can see the partition information on that particular drive?