Systems and methods capable of providing customized business processes, such as with regard to intermediate business transaction documents, within a standard business process flow system. The systems and methods may include a process interface for receiving the standard business process flow; a developmental graphical user interface capable of developing a plurality of object-oriented custom modules indicative of a plurality of custom business steps; a plurality of data libraries capable of storing at least configurations and rules applicable to the plurality of object-oriented custom modules; a run time graphical user interface capable of selecting multiple ones of the plurality of object-oriented custom modules for inclusion in a custom process stack; and a trigger sensor capable of receiving a trigger indicated by one of the configurations at the process interface, and capable of diverting the standard business process flow to process the custom process stack related to the trigger according to the configurations and rules upon receipt of the trigger.