Tests in the test lab are linked to the actual stored test by a path. This path will change if you try to force feed the test set and tests. I would not recommend attempting this as it is out of scope for QC. I am not saying it can not be done however.
Success is the ability to go from one failure to another with no loss of enthusiasm.
~ Winston Churchill ~
Most likely this will not work because a testset uses a unique test_id for each test_name. A testset depends on these test_ids, from the "test" table, and place it in the Test_Cycle table. So making the export a real pain.