The document describes how to create a master-slave relationship between two grid views in Visual Web Developer. It involves setting up the first grid view to display the "master" table and enable row selection. The second grid view is used to display the "slave" or child table, with its data source configured to show only rows that match the selected row key from the first grid view. Clicking a row in the master grid view will then display the related rows from the slave table in the other grid view below it.