You need to detect when is the time to go to the next level - you can do it e.g. picking all instances of bricks, and checking if count of picked objects equals zero.
(But you might have already resolved this, so onto your main question).
Once you want to go to another layout, in the event sheet add an action system-> goto layout , or (which I would choose) system -> goto layout (by name) - as you can simply name your levels/layouts "L1", "L2" etc, and then just jump from one to another, by using a global variable that keeps track of which level you are currently on.
Hope it helps,