Mit der Production Mapping-Lizenz verfügbar.
You can choose a new spatial reference to use with an instance in the New Instance or the Instance Properties dialog box. You also have the option to choose an existing spatial reference.
- Start ArcMap.
- If you do not have the New Instance dialog box open, right-click an existing instance from the Product Library tree view and choose Properties to open the Instance Properties dialog box.
-  Click the plus sign (+) next to Spatial Reference. 
 
- Click the cell next to Use Existing.
- Click the drop-down arrow that appears and choose False.
- Click the cell next to Base Spatial Reference and click the ellipsis (...) that appears. 
The Spatial Reference Properties dialog box appears. 
- Click Select. 
The Browse for Coordinate System dialog box appears. 
- Navigate to the coordinate system you want to use for your area of interest.
- Click Add. 
The Spatial Reference Properties dialog box appears. 
- Click OK. 
The New Instance or Instance Properties dialog box appears. 
- Click OK to close the dialog box.