how to setup payment processors for multiple organiazations on one instance of Civi? for franchise type locations
not sure I totally understand but if I do what you want is to setup one "Financial Type" for each chapter and then on each donation page you can select which Financial Type the money will be assigned to. You can also, if necessary, setup multiple payment processors -- one org we work with has 10 different processor accounts and financial types in order to keep chapter funds distinct. 

you also might look into the civicrm multisite extension