Ok sorry.
Example:
Bob works for company A. I create the contact in the central business database. I also write interactions: emails, phone calls etc.
Bob changes company, now are working for thecompany B. I can either create a copy of Bob in the database (and thus have a duplicate in the contacts) or move him from A or B in the database. Is it right?
But If I move it though, I have seen the interactions change: I no longer see Bob's name in the contact interaction (business central sure not see the contact because i move it). So it seems like the best method is to create a copy of the contact. How do you do it?