You can define break groups in the Report Wizard or create them manually.
To create a break group manually:
In the Data Model view, drag the group that contains the column at which you want to break your report down from the query object about 2 inches.
Select the column that you want to use to divide your report (for example, if you want to group a list of employee data by department number, select the department number column) and drag it out of and above the group to create a new group. This is the break column.
Double-click the new group object to display its Property Inspector, where you can set properties for the break group.
About matrix with group reports
Creating a multiquery group above report
Creating a matrix (cross-product) group
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