Separating Books Marked As Multiple

I will start by apologizing if this has already been addressed. I did search for other entries but none seemed to match my situation, though I did not read every single entry (maybe 20 or so). Also, I apologize if this is not the best place for my question.

In my Work Multiples page it lists the following:

Phantom of the Opera (Easy Piano) by Andrew Lloyd Webber (Hal Leonard (1989), 80 pages)
The Phantom of the Opera by Gaston Leroux (Barnes & Noble Inc (1993), 264 pages)

One is a music book and one is the actual novel so to me they're two completely different books by different authors with the same title. Is there a way to not make them be marked as multiple copies of the same book?

I also have the following entry:

Pocahontas for Trombone by Hal Leonard Corp. (Hal Leonard Corporation (1995), 16 pages)
Pocahontas (Easy Piano) by Alan Menken (HAL LEONARD CORPORATION (1995), 72 pages)

It is the same music book but one is for piano and one is for trombone. I can see how this might be considered a duplicate but I have several sets of books that are the exact same music book but for different instruments yet only these two and one other pair is listed on the Work Multiples page. Either way, I would like it to be consistent across all my music books. Is there a way to either get those on the Work Multiples page separated or all my other sets added to it?

That's a case of faulty combining. If you go to those work pages, you'll see a link called "Editions" in the left hand column. If you go there, you can separate things out.

Thank you!!

If you need help, folks here are always willing to lend a hand

https://www.librarything.com/groups/combiners

It's always a good idea to make sure that all the information needed for proper combination (and separation) is available in the title.

Separated https://www.librarything.com/work/24476681/editions. I don't see a clear combination.