tripple boot

hi..

i have WinME on my c:\ (fat32 1.5gb)
then winNT on d:\ (fat32 3.5gb)
then the remaining till 40gb is my backup..
this is my current dual bot setup

i have an additional 4.3 gb hdd…and want to install RH7.1
i have sucessfully installed rh7.1 before…but have never done a tripple boot.
how should i proceed so that i can get rh7.1 as an option in my bot menu…

and yep…i have all my backup on cd-rw’s….no no worry about that…it’s just i want to avaoid formatting/reinstalling any os….

tia

regards
Mayuresh