What is the method for directing focus toward the subset within an existing class?

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The method for directing focus toward the subset within an existing class is known as filtering. This involves applying a set of criteria or conditions to the class to isolate and display only those objects or instances that meet those criteria. This allows the user to focus their attention on a specific subset of the class and perform operations or analysis on that subset alone. Filters can be applied through various means, such as through a user interface or programming code, depending on the context of use.