You can also now use Model Groups in the sequencer tab now which are much more dynamic (IMO). Creating WH model was an extra step the way I was doing it (which I may not having been doing it the most efficient). Now when I add something to a model group and flip back over to the sequencer tab, hit Render all, and continue on. Just my two cents worth. (I'm actually now working to remove all WH models from all of my sequences and will permanently get rid of them.)