Thanks, @Vince_Mustachio! The rules are project-specific; you select a project and then specify the rule to add for that project. One of the main reasons for that design is that the Asana API doesn’t provide a way to be notified of changes across an organization, only on a per-project basis.
I do, however, have a “Copy Rule” function on the planned product roadmap to make it easy to copy an existing rule to additional projects without having to rebuild it for each one (although it only takes a few seconds to build a rule!).