Actually there is always a forum for RDLC but it is listed for the product which is ReportViewer control both for Winform and Webform so check below and start a thread.
then why don't you have a clear and full category an sub category list on the home page? i think it will be easier if you do that, let's say just list the category as an expandable lnk to view the sub categories.Jassim Rahma