The AGGREGATETEXT attribute defines a label to be displayed for aggregate fields.
AGGREGATETEXT = [%]"string"
The AGGREGATETEXT attribute can be specified at the AGGREGATE field level, or globally at the TABLE level, to define a label for the whole summary line. When defining the AGGREGATETEXT attribute at the aggregate field level, the text will be anchored to the value cell. If the AGGREGATETEXT attribute is specified at the TABLE level, the label will appear on the left in the summary line. When an aggregate text is defined at both levels, the global aggregate text of the table will be ignored.
AGGREGATE tot = FORMONLY.total, AGGREGATETEXT="Total:";