C:Program Files (x86)Microsoft Visual Studio 14.0>witadmin importwitd
   /collection:"http://{tfsServerName}/tfs/{teamProjectCollection}"
   /p:"{teamProject}"
   /f:"C:{localpath}ScrumWorkItem TrackingTypeDefinitionsEpic.xml"

C:Program Files (x86)Microsoft Visual Studio 14.0>witadmin exportwitd
    /collection:"http://{tfsServerName}/tfs/{teamProjectCollection}"
    /p:"{teamProject}" /n:"Epic"