All references to a block must be erased before you can purge its block definition. 
-  Click 
	  button 
	    . .  The Purge dialog box displays a tree view of named objects that can be purged. 
	  
- If necessary, click Purgeable Items. 
  
- To purge blocks, use one of the following methods: 
	 
- To purge all unreferenced blocks, select Blocks. To include nested blocks, select Purge Nested Items. 
		
- To purge specific blocks, double-click Blocks to expand the Block tree view. Select the blocks to be purged. 
		
 If the item you want to purge is not listed, click Find Non-Purgeable Items. 
	  
- You are prompted to confirm each item in the list. If you do not want to confirm each purge, clear the Confirm Each Item to Be Purged option. 
  
- Click Purge Checked Items. 
	 To confirm the purging of each item, respond to the prompts. 
	  
- Select more items to purge, or click Close.