Assigning Extras after title splitting

I’ve some movies (like Blade Runner) with different releases in the same folder, so in Plex they merged in one title; I splitted apart the movie with the Plex command. But how I can assign to one specific release of the film the Extras that are in the movie folder?
I.E. When I splitted the film all the Extra were assigned to the Theatrical release of the film but I wish to assign them to the Final Cut. There is a way?

Thanks!

There is a trick, which only works with 2 different versions of a movie.
The two versions of the movie need to be each in their own subfolder. They all need to have their own extras files. The ‘common’ extras cannot be shared among the two movie versions.
After the split, you use ‘Fix Incorrect Match’ and use the other metadata agent for movies.

Example: the default metadata agent for movies is ‘Plex Movie (formerly known as Freebase)’. Now that you have splitted the movie into 2 posters, you go to the preplay screen of the second one and click on the ellipsis ( . . . ) on the left side and then ‘Fix Incorrect Match’
A dialog box opens where you click on ‘Search Options’
then select from the dropdown TheMovieDatabase instead
perform the search and click on the first match it presents in the result list.

If you did this right, the second version should have now a different guid= in its mediainfo XML than the first movie.
From now on Plex treats them as separate movies.