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Maintaining the WBS in the Hierarchy Graphic 
Use
You can change the project hierarchy in the hierarchy graphic. You can use the hierarchy graphic to change the project hierarchy, for example, you can add unassigned WBS elements to the project hierarchy or you can move subtrees.
See also:
Creating WBS Elements in the Hierarchy Graphic Changing the Project HierarchyProcedures
Adding Separate WBS Elements to the Hierarchy
The cursor changes to a pencil.
The figure shows in which direction you must draw the line in order to add the WBS element to the hierarchy.

When you release the mouse button, this WBS element is inserted into the project hierarchy.
Separate WBS Elements from the Hierarchy
You can change the project hierarchy by separating WBS elements or subtrees from the project hierarchy.
The WBS element is selected.
The WBS element and all subordinate elements are removed from the project hierarchy.
If you want to connect separated WBS elements or subtrees to another area in the project hierarchy, follow the steps above.
Move WBS Elements Within a Level
The WBS element is relocated.

Even if you have budgeted or planned costs for a WBS element, you can still move it within a level.
