Custom sort within 1 instance of a crystal report group

Using vs2008 crystal reports .net c#

I have a re开发者_C百科port with multiple nested groups. I'm trying to find a way to do different or custom sort, or specify specific order within 1 instance of the groups printed on report E.g report grouping as bellow. Report prints 2 lots of the nested groups as shown.

I want to specify the sort order ONLY for the first instance data coming under GroupHeader1

GroupHeader1  -------> ONLY want to specify customer order in this point only
  GroupHeader2
    GroupHeader3
    Data
    GroupFooter3
  GroupFooter2
GroupFooter1

GroupHeader1
  GroupHeader2
    GroupHeader3
    Data
    GroupFooter3
  GroupFooter2
GroupFooter1