Right click on the group header on the left of the report canvas and insert a section. If you have a Group Header 1, then you will have a Group Header 1a and a Group Header 1b. Simply move the record into group header 1b.
You may have to insert a sort to make sure the right record appears in the group header. On many of my reports, I have date in descending sequence to get only the latest record to display.
-lw