How to add Grub Entry in Existing Grub Boot loader in Linux

1. Install the Linux in without boot loader.
2. Select the boot loader options do not install the boot loader and complete the installation.
3. Boot to the previous Linux installation.
4. Edit the configuration file VI /etc/grub.conf.
5. Add the boot entry in grub configuration file

Add the Title
Title redhat Linux (2.4kernel)
Root (hdo,1) //select the root partition to boot the installation
Kernel /boot/vmlinuz-2.6.16.43-0.5-default ro root=/dev/hda2 //specify the kernel and device partition information