Have this scenario:
An Alien collection in movies, with all movies inside.
A Specials collection in TV Shows, with all Alien specials inside, divided by movie and every section divided in seasons:
- Specials
– Alien
— S1: Pre-Production
---- 1x01: Special 1
---- 1x02: Special 2
---- 1x0x …
— S2: Production
---- 2x01: Special 1
---- 2x02: Special 2
---- 2x0x …
— S3: Post-Production
---- 3x01: Special 1
---- 3x0x …
– Alien 2
— ect…
Reason because I’m not using the special words in the names (scenes, featurette, etc.) is because there are tons of movies and I like to keep them well organized. And TV Show structure is perfect.
Once I create the specials for every movie I join them in a Special collection, so I can have a special section in TV Shows.
Now I’d like to also add the “Alien” tag, so they get related to the movies (I can see specials when I’m in movies and movies when I’m in specials). But, doing so, I also get a new collection called Alien in TV Shows. Well, I’d like to hide it because I don’t need. There’s an option to hide it in edit/advanced but, if I do that, the single specials (Alien, Aliens) appear inside TV shows as single items.
I’d like to hide the Alien collection but not having the single items, as they’re already inside the Special one.
I know it’s a bit confusing, in short words I want this in movies:
And this inside TV Shows:
Without the Alien collection.
Is it understandable? 
P.S. If you’re wandering why only the first two movies it’s because for me only two (good) Alien movies were done). 
