1. In Design View, open the main report
  2. Select the sub report
  3. Right-click and select Change Sub Report Links
  4. Select ALL the items in the Field(s) to Link to: window and click on < button
  5. In the Available Fields window, select CnBio.CnBio_Sortkey (or field being grouped by) and click the > button
  6. In the Select data in sub report based on field drop-down, change it to CnBio.CnBio_Sortkey (or field being grouped by)
  7. Click OK