Grub boot from iso

Hi guys,
I have an iso file for Mac leopard which is about 8GB size. I couldn’t burn it to a normal dvd b/c standard dvd size is about 5GB.
I was wondering if there is a method to use Grub to boot from this 8GB iso file ?
currently i’m using Grub for a triple boot (windows/linux/mac os ).
can someone describe me in details the steps i should perform to boot from this ISO in order to install the software .either using grub or any other method description would be very welcome.