FFS some people get confused very easily don't they Kloppite. The sub is the horse that has attracted the most bets (in $ value) on the win tote. Its highly unlikely two horses have exactly the same dollar amount on them. It has nothing to do with takeouts. Remember the TAB round down every win dividend to the nearest 10c which is a massive rip off. So if horse A was paying $4.29 as a raw dividend and horse B $4.21 they will both show $4.20 but horse B will be the sub.
Yes Gruff I'm bagging the TAB. I don't work there, never have, but no need to concede you got another thing wrong, we've come to expect that from you.