Group in Crystal report 2008

Hi all!

In my report, i want to group my data as bellow.

Warehouse name
   Itemgroup name
       Item Description

Now i am using Group expert tool, but only group done 
 Warehouse
    Itemcode

Can you show me, how to do?

Thank you!

Edited by: Rui Pereira on Jan 27, 2009 5:07 PM