1. A computer implemented method for simplifying an executable system model comprising: providing for selecting a graphical object in the executable system model, the selected graphical object representing a dynamic system and having an input port object and one or more of an input signal, a state, a parameter, and an output signal; providing a plurality of transformation operations for the selected graphical object; selecting at least one of the plurality of transformation operations to modify a structure of the selected graphical object; generating a transformed graphical object based on the selected at least one of the plurality of transformation operations, the transformed graphical object including a shadow object identical to the selected graphical object, the shadow object including a shadow input port object having a port number identical to the port number of the input port object; and incorporating the transformed graphical object in the executable model along with the selected executable graphical object.