To open the Coordinate System Transformation dialog box, in Toolspace, on the Toolbox tab, expand Miscellaneous Utilities 
Drawing Transformations, and double-click Coordinate System Transformation.
The Coordinate System Transformation dialog box displays different categories and systems of coordinates for project coordination.
Categories. Specifies the general category in which the coordinates are grouped.
Available Coordinate Systems. Specifies the available coordinate systems in the selected category.
Selected Coordinate System Code. Specifies the code of the selected coordinate system.
Description. Provides additional information about the selected coordinate system, such as projection type, units, and datum.