Select Criteria on Hierarchical Group

Hi,

I was wondering how to have a select criteria on a Hierarchical Group.

I have a InvenotryGroup table with A GroupId and  ParentGroupId.  I want to pass a GroupId to the report and get all items in that group and under it.  I have set up a Hierarchical Group which does the grouping.

In the data I have Group 26 (Belts)  has sub groups e.g. 80 (V Belts) and 86 (X Belts).

Group 26 does not have items directly attached to it, but I want to be able to pass the Belts Group and get everything in it.

I have tried putting the criteria in both the record selection and the group selection expert, however they both return blank reports.

1.  Is it possible to have criteria on Hierarchical  Group

2. If So - How do you set it up..