I use "Series" for this purpose with my movies. For example, "Star Wars" is the series for all 6 movies, and theater view is set to show only series, so I only see Star Wars when browsing by series, but when I select Star Wars, it takes me to the screen that shows all 6 movies in that series.
Lord of the Rings, x-Men, Avengers, James Bond, etc are others that I assign to a series, there are many more.
There were a lot of posts on this about 6-9 months ago, which a quick search should bring up, to give you detail on how to set this up. post any questions here if you like.