Abstract: A system and method for building engine calibrations for the operation of an engine. The system includes a processor that is operatively coupled to a memory. The system identifies a plurality of features, which may be stored on a memory, relating to the operation of the engine. Each of the plurality of features is associated with a feature calibration data file. A user may selected, such as via operation of an input, which features are to be used in building engine calibrations. The system may implement rules that identify which of the selected features may be combined with other selected features in creating the engine calibration build. The feature calibration files for permissible combinations of features may then be assembled and used in generating an engine calibration.