Adding Components to Your Simulink Model | Getting Started with Simulink, Part 7
Create subsystems and components in your Simulink® model. Create model references so you or your team can work on components independently from the top-level model.
You can also select a web site from the following list
How to Get Best Site Performance
Select the China site (in Chinese or English) for best site performance. Other MathWorks country sites are not optimized for visits from your location.