Hi
Export the test case of QC to Excel and use the tools name :Test Case Migrator Plus" (Excel/MHT) Tool
- migrate test cases (along with test steps) present in Microsoft Excel to VS2010 TCM server AND
- migrate VS 2005/2008 test templates present in MHT/doc formats to VS2010 TCM server
URL :http://tcmimport.codeplex.com/
A good Free tool present in codeplex
Thanks
Abhishek