you can follow this workflow:
1. Open the block dialog box and click the "View source for Name" link. 2. Copy and modify the source, as desired, and save the resulting .ssc file in a package directory on your machine. 3. Run ssc_build on this package directory.
For details on how to package your files and how to run the ssc_build command, see http://www.mathworks.com/help/physmod/simscape/ref/ssc_build.html
Note that the "View source for Name" link is available only for the blocks in Simscape Foundation library. Blocks in add-on products (such as SimDriveline, SimElectronics, etc.) do not have this link.
Thank you, Helen Eventov Senior Technical Writer