Refer to the thread I mentioned in my previous response. It includes a document with instructions.
http://h30499.www3.hp.com/t5/Quality-Center-Support-and-News/Test-Plan-folders-export-to-Test-Lab-in-QC-10/m-p/6195315#M81482
If you have questions about those instructions, respond on that thread with your specific question.
http://h30499.www3.hp.com/t5/Quality-Center-Support-and-News/Test-Plan-folders-export-to-Test-Lab-in-QC-10/m-p/6195315#M81482
If you have questions about those instructions, respond on that thread with your specific question.