This option allows you to specify what happens to any unmatched part of your bet placed using 'Global Settings' when a market is turned in-play. You can choose to 'Cancel', 'Keep' the bet in the market or ask betfair to match at the Starting Price by using 'Take SP'
NB, when using the one of the 'offsetting' options explained on the previous page the bet persistence you choose will apply to both the initial and offset part of the bet
For a full explanation of each of the three options please see the main 'Bet Persistence' page of this user guide.