how to splitting core and cavity or die & punch
what are feature using for splitting
There are several mold design features. They are covered in the Solidworks tutorials if you have access to them. Check under Help>Solikdworks Tutorials>Advanced Techniques.
I've added a screenshot of the features covered in the tutorial:
Answered with a tutorial: https://grabcad.com/tutorials/how-to-splitting-core-and-cavity-or-die-punch