You can set basic formatting for groups with the GroupInfo Collection Editor of the Spread Designer. You can launch the GroupInfo Collection Editor from the Spread Designer by either

• selecting the sheet from the drop down on the right side of the designer and choosing GroupInfos under the Misc. section
• selecting the sheet in the data area and choosing GroupInfos under the Misc. section

The GroupInfo Collection Editor appears as shown in this figure.

Click add and then set the various properties as needed in the Misc. area. When done, click OK.