Parameter Selection via Simulink Model

Hi, I have some Simulink models where the system parameters change based on a user selected manufacture, but otherwise remain constant during a simulation. These models get compiled into a real-time simulation which users need to be able to select between parameter sets without recompiling the simulation. I'm looking for a method I can use to select a Simulink parameter set from within the Simulink model that will get built into the generated code. I would rather not use a bunch of GOTO blocks as this makes the models difficult to understand. Does anybody have a good method to do this?