You can specify the style of linear, angular, or radial dimensions, as well as spot elevations, spot coordinates, and spot slopes. 
- Click Annotate tab
Dimension panel drop-down, and select one of the options.  
- In the Type Properties dialog, select the dimension type you want to work with from the Type list. 
 
- If desired, click Rename to rename the type, or click Duplicate to create a new dimension type. 
 
- Specify the dimension display properties. See Dimension properties for property descriptions.