One approach is to run EP-Macro first and get out.idf. Then out.idf can be run using EP-Launch which will automatically run parametric preprocessor program. AbsorptionChiller_Macro.imf EnergyPlus example file is a good place to start. The HVAC3ZoneMat-Const.idf below can have Parametric:SetValueForRun etc. objects.

##include C:\EnergyPlusV8-5-0\HVAC3ZoneMat-Const.idf