Is it possible to Classify a Class?

We have many classes and it is sometimes very difficult to find the correct class to assign to an object (like a material). I was thinking that it would be great if we could search for a class using CL30N and also using the class search FM "BAPI_CLASS_SELECT_OBJECTS"

But I also think I remember reading somewhere that it was not possible to classify a class. Is this true?

If a class cannot be classified, then, is there an alternative way to search for a class?

If this question has been asked and answered, please direct me to it. I have searched and searched but cannot seem to find anything on the subject.

Thanks,