A drill-across link opens a specific dashboard page when the end user clicks on the KPI dashlet.
Select the KPI, click Edit, and then select Drill Across.
In the Drill Across options, select a page and optional parameters. Then, click Apply.
Publish the dashboard.
The KPI shows a link indicator so that the user knows to click and drill. Resting your cursor over a KPI reveals the linked page name and description, if any.