Create an automation rule For no loss

[mod2017]

Hi everybody I need some help, I would like to create an automation rule but don't know how to do it,I want to go in on a back bet and if the bet goes against me get out at my entry position for what money is left in the market.Example is if I put £10 on back side and it moves the right way and I take £5 out on the lay side and then it moves back to my entry position I want it to close out for the £5 thats still in the market, How do I do this so that I am out with no loss.Thank you

[Dallas]

What if a bet takes yours and the rest of the back money waiting at that price so you're now only able to exit for a 1 tick loss, or if a big bet takes yours and shoves the market several ticks against you?

[mod2017]

Hi Dallas I know you by your good reputation,I am trying to create something that will allow me to trade the favourite as it comes down after a spike but if possible I need it to cover me if it goes against me primarily because I am ok getting into a market but not very fast at getting out due to some mobility issues I also want to drop money in on the way down so the amount I have originally put in will change for example I put £50 in on back and drop £10s in on lay side to max £50 at varying distances and some may be taken.could you help me please I dont know the best way to do it.This is about 5 to 7 mins before the start of the race