We have one pivotal tracker project called "Software Development" which we use to plan development work using velocity and releases/deadlines. We arrange project work into epics within the aforementioned project. To do this with Aha we need Aha to file product features under epics for that product, or let us pick an epic for them to be filed under.
The integration with Pivotal Tracker is a two way integration where you can push your completed features and requirements in Aha! into Pivotal Tracker get status updates back. Aha! features can be mapped to epics or stories in Pivotal Tracker. Please see more details here: