When creating a new Rules project, the user should be given the option of creating a new Rule Flow file (.rf) - the user docs (currently under review) match this screen shot:

http://drools.herod.net/drools-flow/html/images/Chapter-GettingStarted/project-wizard2.png

In JBDS 4.1 CR4, the references to Rule Flow have been replaced with "process file."

See the attached screen shots.