unattended installation of windows 2000 (XP)

Hi all!
I'm playing with unattended installations of Windows 2000 server and XP pro
from CD in my test lab, and everything works fine, except I can't achieve
this:
I have one 30 GB hard drive. I want to delete all partitions on it, create
one primary partition of 10 GB, format it as NTFS and install Win 2000 (or
XP) on it. I know I can put Repartition=Yes line in the[Unattended] section
in the answer file, but then I when installs finish I have windows installed
on my whole hard drive.
If I don't include repartition=yes line, then installations stops through
text-mode part and ask me where do I want to install windows.
Is there any way to control how setup program partition and format hard disk
space from unattended instalations? I had read Microsoft documentation
(unattend.doc and ref.chm), but couldn't find such an option in answer
files.

Thanks!