In NAV 2009 reporting was changed. If you want to use RTC you can convert standard report layout into RDLC. However some classic functions\properties aren't supported in Reporting Services.
Nevertheless Reporting Services has enough abilities. You can look at Table properties/Groups Tab. There is alse the Visiblity Tab but I think in your case it is obsolete.
You can get information about grouping and totaling on MSDN: http://msdn.microsoft.com/en-us/library/dd338686.aspx or http://blogs.msdn.com/nav/archive/2008/11/16/nav-2009-the-structure-of-reports-in-vs-report-designer.aspx