(It's not only the supplier, it's also the trading company. I'm a little link in the chain of my company, so I can't change the organization !)
I don't understand why there isn't a simple tick box to that in the Export dialog box.
Anyway. A HUGE thank you for your link. It's not exactly what I looked for, but I read all the comments, it's very easy to try.
Now my file weigh only 8 mo ! It's a little miracle !
Thanks again