Hi Lisa DeSouza,
Sorry it was a mistake, it should be install.db.files. and you are correct that this command just copy the db driver to the jboss as, etc.
The db structure is created when:
1. When you deploy and start jbpm-human-task.war in jboss AS, then it will create all tables for Human Task
2. When you deploy and start jbpm-gwt-console-server.war in jboss AS, then it will create all tables for Process
3. If you run the sample human task by executing ant start.human.task, it will create all tables for Human Task (same effect as no. 1)
What JBPM version do you use?