Oops i never read you full post
Yeah dsarchy is right, you need to compare the variable to see if the score is grater or equal to 1000, if it is then go to next layout.
You might want to make a global variable called TargetScore,
Then every tick compare that target score to the current score.
Its easier to change ect the, all you have to do is on start of layout set target score to - (x)