Move objects away from a central point

I have a model with lots of individual objects next to each other. Is there a way of plotting a point in the middle of it all and saying all these objects should move away from the point.I am trying to create an exploded diagram by showing that all the objects fit together.

I guess in the same way that when you create a circle and place a central point you can keep moving the circle away from the point as it gets larger...i would like my objects to move away from this central point.

Any ideas?

Thanks for everyone's constant help that's offered! I would struggle without it!

George