I have a report as follows, (min date grp) (max date grp) Name ID Elig Eff Dt Elig Trm Dt GRP Smith, John M1234567 02/01/2007 12/31/2078 DET1 Smith, John M1234567 02/01/2007 02/01/2007 DET2 Smith, John M1234567 08/01/2008 12/31/2078 Ok, What I need to be able to do is calculate at the detail level...