Just a follow up related with this, I ask this question to Capitalise, and they were nice to answer that a conditional line like the one I was trying to achieve (which would be written like : Sell XXX 100000 and buy YYY 100000 if YYY is below 125) would execute the sell and the buy of XXX and YYY simultaneous, and my goal is to be able to perform the second operation after the first is successfull filled. I think only possible through coding a specific solution at the moment.
So, if COAL drops, sell COPPER and buy (steel-related) COBALT?
That sounds doable -- I wonder what IB's webinars say??? I haven't watched any in a million years, but I'd certainly start there.
https://www.interactivebrokers.com/en/index.php?f=2227
click on "TWS" and go to Order PreSets and Order Types
Then check the upcoming Live set -- they're very good about answering live in those.
(Historically. Again, it's been a million years since I've watched anything......)