On the bottom right side, use the Quote instead of the Reply...at the bottom of your post you'll see a blue box about inserting quotes, click that and a window pops up with all the posts you clicked on. Can't remember the specific wording but you can just pop the multiple quotes right into your post.
That's pretty much it
But it doesn't bring in the cascade, only the one I clicked on. I can manually cut and paste the HTML, but somehow I think there is an easier way.