Automation with stop loss

[Al See]

Sorry folks, I know this probably very simple but I'm struggling to get my head around it.

I have a tennis bot that lays any selection depending on certain market conditions.

I'd like to amend this to close the trade by backing the initial lay if the selected lay hits say 40 ticks below my entry point. I don't want to spread the red equally, just place a back bet once my selected lay trades 40 ticks below entry.

Do I need to change my initial lay bet to use global settings in some way or create an additional rule to exit the trade with a back bet?

Thanks