It sounds like you play 12 games but only want to count each player's top 10 tournaments, right?
If so, you can do this using the top() function in the Overall Scores formula. It will help to see your current Tournament Scores formula and Overall Scores formula (from your Stats Profile), but generically you would do something like this:
sum(top(10, scores))
scores is a list of the scores calculated for the player for each tournament. In your case, there would be 12 numbers in that list. The top() function takes those 12 scores and drops the lowest two, leaving the top 10 scores. The sum() function then adds them up and gives back the sum.
If you're not actually computing anything with the Tournament Scores formula but just care about the points each player earns in each tournament, you could leave the Tournament Scores empty and use this for the Overall Scores formula:
sum(top(10, listPoints))
listPoints is already computed for you, and contains a list of the points the player earned in each tournament.