If e.g. the NEHS is broken up I set up the new one (eg with 3 legs) with the strategy builder in the option chain. But unfortunately IB does not link this to my existing portfolio. Therefore I also copy the existing individual options in the lines below the new combo. If I close the combo I see also the individual options being closed (my security check) Regarding p/l tracking I just use my p/l excel.
I know that is not what you are looking for but at least it might be a work-around.