There is no functionality to directly create a ssc-file. So you should use the "Save as" function in MATLAB and change the file extension to “.ssc” in order to save an ssc-file.
Another possibility is to create a copy of an existing ssc-file and change the content of it, so you can easily customize an existing component.
If you need more information about Simscape Language, then please check the following documentation:
What Is the Simscape Language?
Simscape File Types and Structure
Creating Custom Components
