Editing the Work Breakdown Structure 
There is more than one way of creating and editing a work breakdown structure (WBS).
If you only want to work with the WBS...
Go to the Operative Structures menu and choose Work breakdown structure.
Proceed as follows to create a work breakdown structure:
If you want to work with an entire project...
Including all networks and activities assigned to the WBS, choose Planning
® Structure planning from the Project System menu.See also:
Structure PlanningIf you want to edit a project using the project planning board...
Choose Planning
® Project planning boardSee also:
Project Planning BoardThe following sections describe how you can maintain WBS elements and the work breakdown structure under the menu options Operative Structures
® Work breakdown structureYou can copy an existing WBS or a standard project to create a new one, or include WBS elements from an existing WBS or standard WBS in another work breakdown structure.
Creating Project Definitions
Creating WBS Elements
Maintaining Data for the WBS Elements
Creating WBS Elements in the Hierarchy Graphic
Maintaining the Project Hierarchy