How do you link leaderboards from game to game>?

I have a scripter but he isnt being much help,

(I have a game, with child games inside of it as "minigames")

What I need is a script that takes the scores from the "Minigames" and merges it to the Main Lobby so...

+1 loss in minigame = +1 loss in lobby and so on... I already have a leaderboard saving script I just need to know how do I link the two leaderboards?