you can copy the redhat entries in /boot/grub/grub.conf
note down the kernel name, initrd filename, root drive of the suse distro and just replace them on the copied redhat entries.
For example
Code:
#grub.conf
default=2
title Win
rootnoverify (hd0,0)
chainloader +1
title Fedora Core (2.6.8-1.521)
root (hd0,6)
kernel /boot/vmlinuz-2.6.8-1.521 ro root=/dev/hda7 rhgb quiet vga=788
initrd /boot/initrd-2.6.8-1.521.img
# copied from above
title SuSE 9.1
root (hd1,7)
kernel /boot/vmlinuz ro root=/dev/hdb7 vga=788
initrd /boot/initrd.gz