What I would like to do, is have it offset the lay bet with a closing back bet at my chosen price/amount once the lay has been accepted, but I cannot figure out how to do that. I can see I can choose "Close Trade on Selection" which would do the trick, but I don't know what to chose for "Applies to Selection" as I obviously don't know which selection is the one that will be lay until it has happened.
Hope that makes sense...

If anyone could help, would be greatly appreciated