In Crystal Reports XI:
  1. Go to Report > Section Expert
  2. Highlight the Group Footer section for the group that needs to have the page break
  3. Mark the New Page After checkbox
  4. Click OK
  5. Refresh the report
In Crystal Reports 8.5:
  1. Go to Format > Section
  2. Highlight the Group Footer section for the group that needs to have the page break
  3. Mark the New Page After checkbox
  4. Click OK
  5. Refresh the report