Graphical Maintenance of Class Hierarchies
You can also use graphical maintenance to assign classes to superior classes. In an tree, you can set up complex class hierarchies without losing an overview. Each step is logged, so you can undo each step.
While you work, a Recursion Check ensures that inconsistencies are avoided.
On the initial screen, choose 
Last Objects to call one of the last 10 classes you processed. If you have defined layouts for processing hierarchies and want to use one, choose 
Select Layout.
After selecting a class, choose 
Change. To display the hierarchy, choose 
Display.
All classes in the class hierarchy you want to process are locked for other users for as long as you process the hierarchy. This includes classes you insert by creating assignments, even if you undo the assignment again. The classes are not released again until you exit the transaction.
For this reason, we recommend that you keep the class hierarchy you are processing as small as possible.
Upper Screen Area
Other object:You can choose this pushbutton to select another initial class.
Previous hierarchy level: You can choose this pushbutton to call the superior class(es) and restart the transaction with a class you select.
Undo last step: You can undo all the steps you have taken since starting the function, in chronological order.
Display steps so far: You can choose this pushbutton to display the log. This records all the steps you have taken while maintaining the hierarchy.
Left-Hand Screen Area: Overview Tree
You can use drag & drop to copy or move individual assignments or complete substructures within the tree.
The following functions are available in the application toolbar:
Right-Hand Screen Area: List
The following functions are available in the application toolbar:
For more information about pushbuttons, see ABAP List Viewer (ALV) Grid Control.
You can only create a new class in this function if you have the authorization to create classes. You can then enter the most important data for your class. Otherwise, you see a message telling you that the class does not exist.
From the classification menu, choose 
Classification 
Master Data Graphical Hierarchy Maintenance. 
In hierarchy maintenance, almost all functions can be used in several ways: by double-click, pushbutton, menu, or context menu (right-hand mouse button).