Using a COMPUTED column, you can make a variable that will display on each row of your group. For example, REGION is the GROUP variable in the following report. It will have repetitious values suppressed on every report row for Asia and Canada.
However, the computed report item, DISPREG is a report column that will hold and display the value for each region. You can still make REGION a group variable, but then use the NOPRINT option so that it is not displayed on the report. But, DISPREG will be displayed on every line of the report, because you assign it the value of a temporary variable HOLDREG, which you grab from REGION on the first row of every group (when REGION has a value).
proc sort data=sashelp.shoes out=shoes;
where region in ('Asia', 'Canada');