In the Final Battle, when you remove doom tokens for rolling successes against an Ancient One do you stop counting successes for that roll?
I Just Read the FAQ:

Q: In combat with an Ancient One, how do cumulative 
successes in the “Investigators Attack” step work? 

A: To defeat the Ancient One, the players must do a total 
number of successes equal to the number of players multiplied by the number of doom tokens on the Ancient One.

So, if 4 players are facing Yig (doom track of 10), they 
need 40 successes to win. For every 4 successes they do, 
they remove 1 doom token to track their progress. If the 
investigators get 9 successes in the first round of combat, 
they would remove 2 doom tokens, and 1 success would 
carry over to the next round of combat.