Custom boot image on grub2

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http://askubuntu.com – I have created a custom bootable image(.iso) using Multi CD. This image contains Clonezilla,Ultimate Boot CD,Windows Recovery enviroment and much more. I checked whether the image was bootable or not and it worked fine. This image file is like my custom rescue disk. I want to create a separate partition with this image on it and adding a grub menu entry. 1) In which file system do I format this partition 2) How do I create this GRUB entry? 3) What do I do if I wanted to edit this image file. (HowTos)