Hello Mike,
Thanks for your posting. You can implement this by re-running an existing test run. Clicking the ‘Rerun’ button in the toolbar of a test run launches the standard form for adding a new test run but pre-filled with the details of the previous test run (including the test case selection).
The re-run feature is also available for test plans (collection of test runs). Test plans have the additional option to load a previous test plan with the Load Test Plan button on the add form (but which is basically the same as re-running a test plan). I just added the feature request to our bug tracker to add the same button to the add form for test runs.
Just let me know in case anything is unclear.
Regards,
Tobias