How can I export test execution plans from QA Director?

I know that there is a report called Execution/Execution Plans, which can export the execution plan itself. However, this information by itself is not useful, since I need the additional information which tests are associated with the test plan.

I have tried the "Configure" functionality and use the "Asset" tab to add the tests as the second level. Unfortunately the second level is disabled (greyed out).

Test Execution Plan Report Configuration

Is there a way to export the test plans in a way that I can associate the tests with them?