Use IBM Cognos Business Intelligence Suppression
Suppression of rows or columns in a crosstab is based on the cell values in the crosstab. In nested crosstabs, if you suppress the detail rows of an inner nested item, then the outer nested item is also suppressed. This applies to all nesting levels in both rows and columns.
Access to the suppression feature depends on the settings in your modeling component, IBM® Cognos® Transformer, IBM Cognos Framework Manager, and IBM Cognos BI Administration. For more information, see the IBM Cognos Business Intelligence Administration and Security Guide.
IBM Cognos Analysis Studio performs all calculations before applying suppression.
By default, Analysis Studio removes the opposite rows and columns that contain zeros and nulls. If you want to remove only nulls, from the Settings menu, click Suppress, and click Empty Cells Only.
A suppression icon next to the item label in the row, column, or overview area indicates that suppression is applied.