Sum of Stakes (Liability)

Hello guys.... I hope you´re fine....

Need some help with the sum of all stakes (Back bets + Liability of Lay Bets). In the images below you see that I have the liability of the Lay Bet and Stake of the Back bets.... I want to put all them together in a cell of the Engineer Mode. In this case, the sum of all stakes (back and lay) is a liability of 85£ in the horse "Party Fears Too".

Do you need these values for each runner? Then why do you sum them from different selections?

Hello Tim.... Maybe I don´t need for all of the selections. I´m a bit confusing about some terms in the software (tradeout, tradeout_net_pl, market_tradeout, etc.)....

What a need is a stoploss that fires when it´s half of my responsability is reached. But in some cases the trigger misses the exit odd and I loose all. How can assure that the trigger (tradeout is what I´m using) don´t miss the exit odd?

I believe it should be "Selection's Trigger Expression market_tradeout is less than -X/2" where X is your "responsability"