i think what i would do is create a branch with leaves on it, group it, and then duplicate the group (so the leaves are already placed on a branch) and then just position the branches instead... but start out small. create a branch with like 10 or so leaves or so on it, duplicate that branch a few times, and stick them on a larger branch... THEN take that new branch and duplicate that a few times, and stick those on an even larger branch... then take that branch and duplicate them and stick them on your tree.