Do you need work item hierarchy in TFS?

Is so have a look at Notion Tools from Team System. This set of tools provides

  • A timesheet based on works items that you access inside Visual Studio
  • A work organizer  to manage work items and documents allowing creation of hierarchies
  • A work planner to help schedule resources for future iterations.

Well worth a look as a means to extend the reach of TFS into your Agile projects.