How to set read only for a folder structure in Requirement module in QC?

Hi,

I created a new user group, MY purpose is that only the group users have edit permission for an requirement folder , and other groups only can read only for the folder, could you please give me some suggeation?

In Requirement module, we can make all entities read only for other groups using the code:

if not User.IsInGroup ("Test") then

For i = 1 to Req_Fields.Count
Req_Fields.FieldById(i).IsReadOnly = true
Next

end if

But how to filter it for a specified requirement folder? Thanks.

BR
Derek