Nelson,
The idea is to use Guvnor as a knowledge repository, so you can load your processes there and then the console can retrieve all processes from there. Unfortunately, integration with Guvnor is still ongoing.
That is why the current version of the jbpm-console is using a simple workaround: it uses the "jbpm.console.directory" property that is specified as a parameter when starting the application server and it loads all *.bpmn files from that directory. By default, the installer simply uses the folder where the example process is located:
jbpm-installer/sample/evaluation/src/main/resources
So adding more processes there (or changing the directory to something you like) will have other processes show up.
You can also extend the jbpm-console to support other deployment options.
Guvnor integration should be available in the next few weeks.
Kris