?Partition SuSE 8.1 & Red Hat 20GIG

How do you dual boot with SuSE & Red hat ?
I tried to do it three times now and its pissing me off Extended logical cylinders Primary all that **** is confusing me. I knew SuSE was robust but when I hit expert installation, I didnt know it was going be that damn robust!

Can anybody tell me how to split the 20gig in half during the first stages in the SuSE install ?

The SuSE user guide told me to install SuSE first because it was more powerfull or somthing I know it wiped out my windows when I attempted a triple Boot.

Thanx !mitationrust
Ive been searching www.LinuxQuestions.Org