How to create a center pivot point for mutiple mesh files?

Hello there,
I have a Butterfly which exists out of 7 different mesh files. How can i create one centered pivot point
for this file. So that when i import it into my Compositing software (fusion9) the butterfly has a centered pivot point?

Cause at the moment when i export the .abc file out of Blender --> and i import it into Fusion the pivot point is way of.

So my questions is:
How can i select all the meshes --> and create a pivot point for the whole butterfly?
Thanx in front
Greetz Lenny