Hi Bob,
Insert a Group Header #2b section.
Move the fields from Group Header #2a to 2b.
Use the group header 2a as the section to display column headers. So, you'd need to move column headers from GH 1b to GH2a.
Go to the Group Expert > Highlight the second group > click options > options tab > check 'Repeat Group Header on each page'.
-Abhilash