Is there a way to set a simulation up such that the bodies orbit the barycenter from the start vice orbiting each other?

I'm trying to set up a 3 (or more) body system where the bodies orbit the barycenter but I can't figure it out. All I can set up are combinations of the bodies starting in combinations of orbits of each other. For example, I'd like to set up 3 Earths (or 2 Earths and a Mars) and have them start by orbiting the system barycenter. Right now, I can set up the first two objects orbiting each other, but the 3rd object needs to start by orbiting one of the other two. That doesn't accomplish what I'm looking for.

Thanks.