yup, that's the problem with the hard disk install. You can't add the stuff on the 2 other CDs (there might be a way of doing it by first extracting everything and then combining them - I don't know if it actually works, though).
You can add the stuff on the other CDs by setting up urpmi and then using rpmdrake to select and install the software you want. For how to add the other two CDs look here:
http://www.linuxquestions.org/questi...threadid=95026
This is for adding external CDs. If you don't want to use CDs, you can extract the RPM folders of the 2 isos into a directory and add the RPMs to urpmi sources by something like the following:
urpmi.addmedia -f CDs file://{path to the directory containing the RPMS}