Use the Pin tool to lock a modeling element in place. When you pin a modeling element, it cannot be moved.
If you try to delete a pinned element, Revit warns you that the element is pinned.
If you pin a component, it can still move if it is set to move with nearby elements or if the level where it is placed moves up or down. See Move Lines and Components with Walls.
To pin and element, do one of the following:
Revit displays a pushpin control near the element to indicate that it is pinned in place. To move or delete the element, you must first unlock it by clicking the pushpin control. Click the pushpin again to lock the element.