So let me explain the situation here:

I have a whole database with different layouts, on the last layout, I created a button to validate all my informations.

But I want that button to export 2 specific layouts into a new file (which would be the historic).

How can I export those informations into a new file? (what type of script should I use?)

You can't export/import a layout, only data.

Following on from Steve... the data is separate from the layout. You can export the data easily and import it into another database.

In FMP layouts determine how the data is formatted. Layout elements can be copied and pasted between databases, but they are separate and different fom the data (records).