Answer / prabhukumar

Level span is used to eliminate duplicates in data, in Cognos it is used repeat grouped item. Using level span we can see the grouped data group by group.
For example, when country and city are both grouped, you can choose to show the country name each time .
-- the country changes, by spanning Country by Country
-- the city changes, by spanning Country by City
-- there is a new record, by specifying no spanning
Spanning one grouped column by another column is helpful if the second
column contains many items.
Steps
Open the report that you want.
Click the column for which you want to set the group span.
In the Properties pane, click the Group Span property and click the
column you want to span.

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