I know what the issue is as when you get to TD 8.0 you can create a tree in the test lab area. The only way to get the histories to go with the new copy is to move it, not copy it. So you have to decide which you want to do. Unless you would like to try it with a SQL statement and duplicate the table. That might work.
Success is the ability to go from one failure to another with no loss of enthusiasm.
~ Winston Churchill ~
Uhmm. The run results are specific to a particular run of a particular test set.
Certainly you can copy the 'tests' around to different test sets. That makes sense. Copying results, however, would make it look like you did additional testing when in fact, you did nothing. That makes nonsense.