You can create a new viewport with nonrectangular boundaries by converting a geometric object created in paper space into a layout viewport using the MVIEW or -VPORTS command. 
- With the Object option, you can select a closed object, such as a circle or closed polyline created in paper space, to convert into a layout viewport. The object that defines the viewport boundary is associated with the viewport after the viewport is created. 
  
 
- With the Polygonal option, you can create a nonrectangular layout viewport by specifying points. The prompts are the same as the prompts for creating a polyline. 
  
 
- If necessary, click a layout tab. 
  
 
- Set the current layer to a layer that's reserved for layout viewports (recommended). 
	 
The border visibility of layout viewports is controlled by layer visibility. 
	 
 
   
-  Click 
	 

. 
   
- Follow the prompts. 
  
 
Note:  When you want to suppress the display of the boundary of a layout viewport, you should turn off the layer of the nonrectangular viewport instead of freezing it. If the layer of a nonrectangular layout viewport is frozen, the viewport is not clipped correctly.