I want to propose a trade between 3 teams. It has salary retention of the same contract by 2 teams to make it work. This has been done before in the NHL so the final team only gets hit for 25% of the AAV (David Savard from CBJ to Tampa, with Detroit involved to retain some AAV). How do I do this in the trade machine?

Also looking into how to do this... Let me know if you figure it out!

Not possible unfortunately.