Suppressing repeating values
When you sort on a column, there might be several rows with
the same value in one column. You can choose to suppress the repeating
values in that column.
When you suppress a repeating value, the value displays at
the start of each new page and, if you are using groups, each time
a value changes in a higher group.
For example, if you have sorted employees by department ID,
you can suppress all but the first occurrence of each department
ID in the DataWindow object:

To suppress repeating values:
-
Select Rows>Suppress Repeating
Values from the menu bar.The Specify Repeating Value Suppression List dialog box displays:

-
Drag the columns whose repeated values you want
to suppress from the Source Data box to the Suppression List box,
and click OK.
If you change your mind
You can remove a column from the suppression list simply by
dragging it and releasing it outside the Suppression List box.