Modifying topic classes and instances
Class is a topic that describes the type of the topic. Each topic may contain zero or more classes.
Class is added to a topic by right-clicking the title header Classes and selecting Add class. Operation employs pick-a-topic-type window used to point the topic class. Topic's class is deleted selecting a row in the class table, right-clicking the row and selecting Loose classes.... Multiple classes can be removed at once.
Also Topics > Add to topic > Add class menu selection adds topic a class and Topics > Delete from topic > Loose classes deletes the class but leaves the class topic intact.
Modifying topic instances
Instance is added to a topic by right clicking the title header of Instances table and selecting Add instance.... Instance is deleted by selecting row in the instance table, right-clicking selected row and selecting Loose instances....
Also menu selections Topics > Add to topic > Add instance and Topics >Delete from topic > Loose instances can be used to add and delete instances.
