Create Category Wizard

Use this dialog box to create a category for grouping coordinate systems. Coordinate system categories appear in the Coordinate Systems Library. To delete or view the details for a category, click Manage in the Coordinate Systems Library

Code
Enter a code that is unique across all coordinate systems. It cannot contain spaces. Only the following characters are valid: A-Z (upper or lower case), 0-9, dash, and underscore. AutoCAD Map 3D toolset displays the code in the Coordinate System Library.
Add Coordinate Systems
Select coordinate systems in the Available Coordinate Systems list on the left and click Add to move them to the Coordinate Systems In This Category list on the right. To remove a coordinate system from this category, select it in the right-hand list and click Remove.