P6 Professional recognizes four status types for WBS elements: Planned, Active, Inactive, and What-If.
Planned WBS elements
If a WBS element's status is Planned, then the WBS is in the planning phase. Work has not yet begun.
Active WBS Elements
If a WBS element's status is Active, then the WBS is currently underway.
Inactive WBS Elements
If a WBS element's status is Inactive, then the WBS has ceased or is placed on hold.
What-If WBS Elements
If a WBS element's status is What -If, then the WBS is being analyzed before establishing a more permanent schedule.