Customizing TestManager migration to QualityManager

I am trying to customize the migration of our test cases from Test Manager to RQM 2.0.1. I would like to set the "Theme" category to the value of the test case's current test plan name in Test Manager. For example, I have a test case "TC1" in Test Manager under the "Test Plan ABC". When migrated I would like the "TC1" test case to have a Theme value of "Test Plan ABC". Is this possible. I have seen the information located here http://publib.boulder.ibm.com/infocenter/rqmhelp/v1r0m0/index.jsp

I have tried to update the RQMMigration_TestCase.xml changing the
<category> line to various things like
<category><CDATA></category>
etc, but have had no luck.

Any ideas?