Currently in Revit the only way to assign the GIS Coordinate Reference System Code is by acquiring coordinates from a CAD file or other Revit model with the correct code already assigned. It would be immensely beneficial when setting up shared coordinate systems to be able to manually change the CRS directly in the Location Weather and Site dialog.

Ideally this could look similar to the Coordinate System - Assign dialog in Autocad Civil 3D where you can search for and assign different Coordinate References Systems.
