Help for site who call to several prestashop.

[PrestaPanda]

Hello, I'm trying to make a site who call to several prestashop and need some help.
Imagin that there is one site and Two prestashop like the drawing.
There is one Database with this three table:

"vitrine_article"
"prestashop01_article"
"prestashop02_article"


When an administrator add an article on his prestashop, it naturally add this on the table prestashop(number)_article.
Now, what i'm looking for doing is: making a copy of all the article's parameters in the table "vitrine_table".
How can I do that?
I've search into the code but don't found how to do it.