# Classification

## How to Navigate within the Class Hierarchy

| ### What to do:
| To work through this example, you must have completed the examples Create a Class and Create a Class Hierarchy / Structure.
| Select Start > Classification > Classes. The Class mask is opened.
| Find the class CLS-1000 Bolts.
| Select the Subclasses tab. A list of classes one hierarchy level below the selected class CLS-1000 Bolts is opened. The Child field contains the number of subclasses for this class.
| Highlight the class CLS-1200 Machine bolts and click . The selected subclass CLS-1200 Machine bolts is displayed in the form header and the Subclasses tab contains two new classes. You have moved one level down the structure.
| Highlight the class CLS-1210 Hexagon screws and click . The selected subclass CLS-1210 Hexagon screws is now displayed in the form header. The Subclasses tab is empty. You have reached the lowest level of the hierarchy.
| Select the Superclasses tab. A list of classes one hierarchy level above the class is opened.
| Highlight the class CLS-1200 Machine bolts and click . The selected superclass CLS-1200 Machine bolts is now displayed in the form header. You have moved one level up the structure.

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