A class groups a collection of rules or other objects. Each class defines capabilities (rules that include properties, activities, and HTML forms) that are available to other, subordinate classes, or to instances of the class. Classes are organized into a hierarchy, where the system searches the class hierarchy from the current class upwards when looking for a rule to apply. A class is an instance of the Rule-Obj-Class rule type.
In the Apply To field, specify the class that the property belongs to.