Break On

This field is available to assist with the creation of Sub-Totals.   When you highlight a particular field and click on the Break On button, you will notice several changes.  That  field and all fields above it will become grayed out.  Those same grayed out fields will automatically appear in the Sorting tab as the first columns to be sorted (this order will be enforced and you will not be able to manipulate those fields on the Sorting tab).

The field that you have identified with the Break On button will also have a special character as the initial character (  §  ).

All other fields above any Break On fields will have another special character that appears as a single dot ( ·  ) preceding the field to help identify that it will be automatically included in the sort (as some browsers will not display the grayed out background).