Based on user selection:
Build your logic on the controller class based on the user selection by using if condition.
e.g. for get the user selection.
//Get contract class
PSAQuotationsContract = this.parmReportContract().parmRdpContract() as PSAQuotationsContract;
//Get the user selected value
PSAQuotationsContract.ParmeterYourNewField();
Let me know if you have any clarification.