Hello,
You can try using Test Case Migrator Plus.
Test Case Migrator Plus[
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This tool lets you import test cases from an Excel spreadsheet or from word/mht.
Before using it you will need to export your test cases to Excel, there are plenty of way to do it, here's another codeplex project that can help you:
http://testcaseextractor.codeplex.com/[
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Good luck...
Valery.