Steps to upload test cases from an excel sheet into Test Director:
1)Install the excell ADDIn
2)Open a new Excel sheet(Option Export to Test Director appears)
3)Create the test cases in excel(it should contain the same no. mandatory columns/fields as that in Test Director)
4)Click on Export to Test Director
5)Map the columns of excel to the fields of TD and click on ok.
6)Test case gets uploaded