problem with install software with ISO image

I 've added
/windows/D/openSUSE-11.1-DVD-i586.iso

to yast -> software repositories.

But when I use software management to install something offline,
it can’t works.

How to let it know read from ISO image first?

If it is working then it will install from there so long as you are not online and even if you are online it will use that unless online offers a newer version.

Check it works by temp disable all repos except the .iso

I think perhaps I got it.
I set its priority to 90 (default is 99).
So it can read from ISO first.