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Re: Delete unused worksets?
Alright, it is not just about 3D objects. There might be elements on 2D views that belong to user-created worksets such as model lines, rooms, spaces, room and space seperation lines, levels and grids, REVIT links, so on... these elements might have been assigned to user-created worksets by mistake. You need to make sure that all these elements in 2D views are assigned to proper worksets. Depending on the number of views that are already created, it may take either an hour or days.
Tip: Even though a REVIT link is assigned to a workset in the Properties Palette, it needs to be assigned to the same worksets under the Type Properties. Otherwise, it would be controlled by two different worksets and whenever you turn one of those worksets off, the link will disappear. So make sure in the Type Properties, REVIT links are not assigned to the worksets that you want to delete.
Let me know if you have any questions.
BIM Specialist @CRS