Organizations can set up Volunteer projects in the the Volunteer Library and enable them for sign up in their Kintera Thon event through Blackbaud Sphere. They can report on the Volunteer Projects through the People: Volunteer Project report. However, the positions available field doesn't seem to match up with the total positions minus the number registered for certain Volunteer Projects.
If a position within a Volunteer Project is used in multiple events the positions available will reflect the Total # Available minus the registrations for all events where that Volunteer Project and position is used.
It is recommended to create new Volunteer Projects for each event or create new positions for that project. Editing previous positions that have already been used in previous events to be used for current events is not recommended.