Open a model in simulink-sensitivity analyzer

Hi everybody, I'm new in simulink and I haven't handle it, I have a basic question.

I wonder if I have to use one of the Simulink "standard model" to use the app "Sensitivity Analyzer" of Simulink or I can load my personal model somehow and made a sensitivity analysis of it. And if not, is there another app/function of Matlab/Simulink which allows to made a driven sensitivity analysis?

Thank you, Ilaria