Use this procedure to convert mass elements to walls. 
- Select the mass element to convert. 
 
- Click  
  
 .   Find  
- When prompted to erase the original geometry, press Enter to keep the mass element, or enter y (Yes) to erase it. 
 
- Specify a point to start the baseline. 
 
- Specify a point to end the baseline. 
The Wall Styles worksheet displays the wall styles that exist in your current drawing. 
  
- Select a wall style and click OK.