Templates in Google Issue Tracker specify default values for fields in new issues in a component. Each component has a default template but may have additional templates as configured by the Google employee who is responsible for managing it. Public and partner users cannot create or modify the templates associated with a component.
When you create an issue in Issue Tracker, the default template for the component is automatically selected. If additional templates are available, you can select them from the Templates drop-down list in the New Issue page.
When you select a template, the fields in the page are automatically populated with the default values defined.