For Paybacks you must first have the correct option selected for the class and then there are some parameters to set. To make the setup easier you create template of the parameters, then it is just a matter of selecting and "pushing" the template into the class. Once the Payback is set it will be calculated automatically as the number of entrants change.
ShowPro has built-in payback tables for the organizations that we support and you can also create your own custom tables.
Payback Tables is available on the Data menu.