Are you referring to a situation where for example 3 people finish on the same score but one is assigned 1st place in the payout, while the other 2 are joint 2nd. I don't know what this ranking of holes is called, but say in the above example one player birdied the most difficult hole in the tourney and the other 2 didn't then the player who birdied would be the leader.
I don't think this ranking is shown on WGT, but the more you play, you will figure out which holes have the higher difficulty rating.
For example, back 9 on St. Andrews, #13 and #17 are probably the most difficult, so birdie these 2 and finish joint top, and you can be fairly sure you are getting the winners prize (unless the other player has done the same)