Create a group by selecting elements or existing groups, and using the Create Group tool. 
- In a project view, select the desired elements or existing groups you want in the group. 
 
- Click Modify | Multi-Select tab
Create panel
 (Create Group). 
  Note: If you have only selected one element type, the respective Modify | <Element> tab displays instead of the Multi-Select tab. 
  
 
 
- In the Create Group dialog, enter a name for the group. 
  
Note: The name of this dialog will vary depending on the types of elements you selected. 
  
 
 
- If you want to open the group in the group editor, select Open in Group Editor. 
  
The group editor allows you to add or remove elements from a group, attach detail groups (for model groups), and view group properties. 
  
 
 
- Click OK.