I stumbled upon a little series of articles at the LinuxFoundation Developer Network explaining the openSUSE Build Service.
The articles are:
- openSUSE Build System: Building Binary Packages for Many Linux Distributions at Once
- openSUSE Build System: Building RPM Packages
- openSUSE Build System: Building DEB Packages
Ben Martin gives a short overview of the Build Service and then explains step by step how to build a binary package. If you’re interested in building binary packages, I advise to read his articles.