Using Categories to Support Flexible Reports and Increase Integration Across Team Projects
You can generate flexible reports and support increased integration across team projects by creating categories that identify groups of similar work item types. By using categories, you can manage multiple types of work items as a group.
Reports that are generated from work item queries can use the In Group operator to find work items based on their category group. You can add or remove different work item types from a category as team project processes change, but the reports remain valid because the category name remains constant.