How to create sub groups

Is there any way in Endnote version x5 to creae a sub group within a group. For example

Group Set–>Group–> subgroup?

I want to create a group within my existing group in my group set.

help!

Try this link:

http://community.thomsonreuters.com/t5/EndNote-How-To/Organizing-Group-Sets-and-Groups/td-p/24041