thanks for the advise . i read the debian installer internal . i really interest in DI . but after reading debian installer and watching some video about DI in deb meetings i have some unsolved understanding problem with DI . i can't understand the steps that need to build a custom distro based on debian using DI. i work with live helper . in live helper before building whole iso , live helper prepare a chroot environment for you to add or changed the things that you want in addition to the live helper configuration . and then make a live cd from that chroot environment (and it can add a debian installer in your CDD) . i want to know does DI do such thing ( i know it does ) but i don't know how . i can't understatnd the consept .
at last thank you for your attention -- Lucifer