Edit Grub? help!

Please help!

I have installed 5 Linux OS in the following order:

1st : OpenSUSE 11.0
2nd : Ubuntu 8.4
3rd : Ubuntu 8.10
4th : OpenSUSE 11.1
5th : Fedora 10

Here is the scenario, at the 4th installation i can still choose which OS to boot as what OpenSUSE grub displays. Now, after installing Fedora 10 all grub OS's choice are not displayed as it will only boot to Fedora.

Now, can i brought back or restore the OpenSUSE grub OS options by editing grub?
And how to do it? As I am new to linux.

more info:

Fedora 10 fdisk -l output

Disk /dev/sda: 80.0 GB, 80026361856 bytes
255 heads, 63 sectors/track, 9729 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x0008c500

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1               1        1306    10490413+  83  Linux
/dev/sda2            1307        1568     2104515   82  Linux swap / Solaris
/dev/sda3   *        1569        6052    36017730    f  W95 Ext'd (LBA)
/dev/sda4            6053        9729    29535502+  83  Linux
/dev/sda5            1569        2873    10482381   83  Linux
/dev/sda6            2874        3134     2096451   82  Linux swap / Solaris
/dev/sda7            3135        4350     9767488+  83  Linux
/dev/sda8            4351        4593     1951866   82  Linux swap / Solaris
/dev/sda9            4594        5809     9767488+  83  Linux
/dev/sda10           5810        6052     1951866   82  Linux swap / Solaris

/boot/grub/menu.lst output just in case.

# grub.conf generated by anaconda
#
# Note that you do not have to rerun grub after making changes to this file
# NOTICE:  You do not have a /boot partition.  This means that
#          all kernel and initrd paths are relative to /, eg.
#          root (hd0,3)
#          kernel /boot/vmlinuz-version ro root=/dev/sda4
#          initrd /boot/initrd-version.img
#boot=/dev/sda
default=0
timeout=0
splashimage=(hd0,3)/boot/grub/splash.xpm.gz
hiddenmenu
title Fedora (2.6.27.5-117.fc10.i686)
        root (hd0,3)
        kernel /boot/vmlinuz-2.6.27.5-117.fc10.i686 ro root=UUID=dd624eff-f1d0-46e2-8d60-1c15f3233f62 rhgb quiet
        initrd /boot/initrd-2.6.27.5-117.fc10.i686.img

What may or may not do the trick: copy the menu entries listed in Suse's /boot/grub/menu.lst to Fedora's counterpart (see GRUB manual for some background information).