Hi Michael and thanks for the script !

It's not exactly what I need but it could be useful.

I have multiple models on my gridplane (each one has multiple objects and styles), I work like that so I can get an overview of the different variations I made of the same design (for example right now I'm working for Parmigiani Fleurier, making watch displays so I got many things on my single document. That's why I can't keep everything overlapping on the origin point)

What I need is a script that create a bounding box of the selection, pick the bottom point (centered) of it, move it to origin, export then put it back where it was and delete the bounding box :)

Thank you for your help