i havent seen angry dog and im not on my mac so i cant right now. but do u mean u have a score for each scene then at the end scene (example- game over scene, or game complete scene) you want to display the combined score of each level? if so you set up the score like you would with a diferent score attribute for each level. at the end scene where you want to display the combined score add a display text actor, find your level one score attribute click on it. when its displayed in the blue in the expression editor put a + sign outside the blue then add the next score then another + then keep going untill your expression adds every score. then the text displayed with be all scores from each level added together as a high score would.
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hope i helped.