you have to split the original sequence into reels, and make EDLs,
at the same time, split your existing ProTools sessions into matching reels.
then split the current sequence into reels and make EDLs.
or do it the old fashioned way and make lots of hand-written notes.
depending on the number of edits,
you might get away with less splits and larger sections,
but the standard 20 minutes or less IS a standard,
and is useful in many stages of post production.
there are other software solutions for this sort of process.
(i dont remember their names)
i don’t know if they can handle more then 999 events.
maybe they can.
from memory they are all rather expensive.
nick