A modular data structure is provided for storing a compilation of actual data input to the a complex workflow system via a field document. A standard data array module correlating to a standard data input interface of the field document is provided. The standard data input interface receives input of standard actual data to populate the standard data array module. An optional data array module correlating to a respective optional data input interface of the field document is also provided. The respective optional data input interface receives input of optional data to populate the optional data array module. The optional data array module and the correlative optional data input interface are added to the workflow process as a conjunct to the standard data array and correlative standard data input interface.