How to add a subclassification rule to an element

Summary:

How to add a subclassification rule to an element

Content (please ensure you mask any confidential information):

We need to add a subclassification rule to an element. Can you help how to do so?

Thanks

Trisha

Version (include the version you are using, if applicable):

23D

Code Snippet (add any code snippets that support your topic, if applicable):