"If" bets allow you to have a second wager based on a win (or push) on the first selection.
If bets must be made at the same moment (you cannot place part of the bet now and the other part later).
The second selection in the if bet cannot exceed the amount of the first selection.
Dallas Cowboys -5 $110 to win $100
If (if win, tie, or cancel): Carolina Panthers +4 $110 to win $100.
If the Cowboys lose, the wager stops there and is scored a loser -$110; if the Cowboys win +$100 the wager continues to the Panthers bet; if the Panthers win also, the wager is a $200 winner; if the Panthers lose the wager is a $10 loss.