Define the layout of the screen that users see in a browser window by using a harness. Harnesses define the run-time layout of your portal or a work form in your application.For example, a harness can divide the portal into three separate areas: a header, a navigation pane, and a large content pane for displaying documents.
In the header of Dev Studio, click.
On the Create Harness tab, in the Label field, provide the name for the harness.
To override a standard harness, in the Label field, enter the name of the harness that you want to override.
In the Context section, define the application, class, and target ruleset for the harness.As a best practice, select the name of the class that contains the work items that the harness supports. Choose the class that is most specific to the application and its work items, rather than a general Work- class.
Click Create and open.