There are a couple of ways to install from hard drive, which I will summarise here. One option is using boot floppies: you copy the CD contents to a free patition, make the set of seven boot floppies and booting from the floppies will allow an install using the hard drive source. The other is to copy the CDs to hard drive and add an install ooption to your bootloader linking to the installation kernel of the CDs. There are full guides on
www.opensuse.org