Adding buildings from another airport.

Dumb Question. i forgot how to take a building from another airport, like KLAX and put it in KJFK. i have to convert the bgl to a xml. then i forgot what to do next. can any one help?

I would load airport 1 into ADE, right click the building and select "Copy Object" from the menu.
Then load airport 2, right click where you want that building and select "Paste Object".
I've done it like that several times for FS2004.

if they are generic buildings just right click on the building and "save generic building" and give it a name.. if its a custom building i think you just scan the bgl with the library object manager