A named position is the placement of a model instance in a Revit project.
By default, each Revit project contains at least one named position, called Default Site.
If your Revit project contains a unique structure or a site model, it typically has only one named position.
If your Revit project contains several identical buildings, it will have many named positions in it.
You may want to locate several positions of the same building to create a campus. For example:
You might also want several positions for a unique building. To do this, import the building into a site model, then move the building around on the site by choosing different positions. You may want to do this during schematic design, when you are trying to decide exactly where a building will be positioned on a site.
You can delete, rename, and create new named positions, and switch between different positions.