Afaik you dont even need episode names. You can import manually and sonar should recognize episodes just from numbers.
By default it doesnt move files, it makes hard links so you end up with 2 files, but they take space only for 1.
Im not sure is there any other way, but you probably need source files on the server.
Create folder data/source/movies and data/media/movies, set data folder as root folder in radarr, then add movie you want and import file manually from data/source/movies