Crystal Reports for Enterprise 4.0: Create a Cascading Parameter Group
Cascading parameter groups allow you to create reports with cascading prompts. With cascading prompts, the response a user provides to one prompt restricts the available responses to the next prompt. For example, in a report with cascading prompts for state and city, the list of available cities is restricted to those in the state that has already been selected.
In this tutorial, you will create a cascading parameter group and use it to filter the data in a report.