There are several ways to use multiple queries to display information. You can create an initialization query that executes once before the master query, you can create multiple master queries that execute in a sequential order, you can create queries using different data sources, and you can create a master query and one or more detail queries.
Reports that contain both a master query and one or more detail queries bound to the master query are called Master/Detail reports. Use Master/Detail reports to show hierarchical information.