How to make songs part of one album in iTunes

To have this showing correctly in the albums do the following from iTunes:Select all the files that is part of the album, Right click, get info, select this album is part of a compilation.Right click on the selection again, get info, add "Various Artists" to the Album Artist.This will fix your library. As an alternative this can be done via an mp3 tagging by setting the following extended tag information

ALBUMARTIST "Various Artists" COMPILATION "1"

In ID3v2.3 and ID3v2.4 COMPILATION set the TCMP Field.

The eyeD3 CLI application can be used to confirm this as well

eyeD3 -v [name].mp3

Or else Puddletag aplication with a custome column added 

Title : Compilation
Field: itunescompilationflag

or edit > extended tags