so I can display specific albums contained a Boxset under their specific artworks/albums as well as the Boxset without copying the files?
Regardless if you have selected Tracks- Album and Tracks- or Album Covers view, the main panel essentially shows tracks. Either individually, or grouped together with other tracks as part of an 'album' (following the rules as set under 'grouping').
One track can never show up more than once at different locations within the main panel. Not in Tracks view, and not in Album view.
So no, you can't have tracks showing up both under an album grouping, and additionally elsewhere under box-set grouping.
It's one or the other, it can't be both.
What you are asking for makes sense though, but it would have to be a completely new feature in MusicBee so it would be able to display the two hierarchy levels of:
box-set > albums, where the box-set by itself would not contain any tracks at all. So it would need to be possible to have it showing as a virtual album with it's own title and artwork, containing the other albums.