Grub and `other' OS

[Harry Putnam]

Severn is my first time using grub... I've been cowering behind
lilo for quite a while.

I'm guessing its pretty easy to do but not so clear just how to set
up an `other' os to be started by grub.

In this case its a solaris (x86) install on /dev/hda.  With past RH
releases I've been starting it with the tried and tru lilo technique:

  [..]
  other=/dev/hda1
          label=sol
          table=/dev/hda
  [...]

Severn is on /dev/hdc1 and bootloader is installed in MBR of /dev/hda
How is this done with grub?