-  Click 
	 

. 
	   Find 
   
- At the prompt, enter 
	 o (mOde) and at the next prompt, enter 
	 s (Standard).
	 
The Standard mode provides additional options that are useful for trimming and extending in 3D. 
	 
   
- Select the cutting edges to use for trimming (1). 
  
 
- Enter 
	 p (Project). 
  
 
- Enter 
	 n (None). 
  
 
- Select the object to trim (2 and 3). 
  
 
Note: When you're done trimming and extending in 3D, you might want to change the mode back to Quick.