I know there's a way, I just would have to have the program in front of me to be able to figure it out exactly, it's a bit hard to recall it all in my head. If it's a premade motion path I would think you could just put everything on the time line, select them all, then add the effect once. If it's a custom path you should be able to save it in some way and apply it to all of them like before I believe. Again I don't have the program in front of me so it's a bit hard, sorry. If that doesn't do it or doesn't make sense try a help forum or something. Wish I could help more!
