I had installed Windows XP on hda1 & Fedora Core (FC) on hda2 & hda3.
I want to install SuSE 9.0 on an empty partition.

# fdisk -l

Disk /dev/hda: 15.0 GB, 15020457984 bytes
240 heads, 63 sectors/track, 1940 cylinders
Units = cylinders of 15120 * 512 = 7741440 bytes

Device Boot Start End Blocks Id System
/dev/hda1 * 1 729 5511208+ 7 HPFS/NTFS
/dev/hda2 947 1854 6864480 83 Linux
/dev/hda3 1855 1940 650160 82 Linux swap

My plan is:
1. install SuSE 9.0 with the "new installation" option.
2. install to empty space 730 - 946.
3. create two partitions:
one for swap & one for /.
Is that hda4 & hda5?

4. Existing menu.lst is:
default=0
timeout=5
splashimage=(hd0,1)/boot/grub/splash.xpm.gz
hiddenmenu

title Fedora Core (2.6.9-1.667)
root (hd0,1)
kernel /boot/vmlinuz-2.6.9-1.667 ro root=LABEL=/ rhgb quiet
initrd /boot/initrd-2.6.9-1.667.img

title Windows
rootnoverify (hd0,0)
chainloader +1

How to add the new boot title for SuSE 9.0?

You can use one swap for all linux, when you install Suse don't install a bootloader (watch for option during install), after Suse install reboots go to FC, add Suse to /boot/grub/menu.lst then reboot to Suse to finish install.
If you plan to keep Suse go ahead and install grub and add the options for FC & XP.