How to copy test cases from one project to another in RQM 2.0.0.1?

If the project area is on the same RQM server, you may use the duplicate option.
Once you select 'Duplicate', you will be prompted with a list of project to choose from to duplicate the test case.

Hope this information helps!!

Best Regards
Rajat

You can leverage openness vision of Rational Quality Manager to literally copy any data to/from RQM using RqmApi
However that requires you to build your own client tool leveraging the RQM API.

As Rajat told, to help you out, an out of the box tool, Copy Utility, you can use, which again leverages RqmApi .

There is another tool available which can give you  basic capability for GET/PUT/POST
it is installed in rqm at C:\Program Files\IBM\JazzTeamServer\server\conf\qm\tools\import\AQXUrlTool.exe and corresponding import.bat for uploading the data. It works with XML files for uploading to RQM.
Doing GET will give to xml from source server
Again this tool needs to be used along with RqmApi