This is all the help that SuSE can provide on this subject. Follow the instructions to the letter. Try using /usr/share/cups/model/HP/OfficeJet_G85-hpijs.ppd.gz as your printer ppd.
If you are using KDE, you should install the kdegraphics3-scan package using Yast2. It should install all the dependencies. You will need the sane package installed to do any scanning. Don't forget to uncomment hpoj in the /etc/sane.d/dll.conf file.