[black_eagle]

Will boxsets selected through Albums be recognized as box-sets also?

If you mean, can you navigate them by album -> disc -> songs rather than (currently) album -> songs then yes.  This will be a selectable setting so you can turn it off and revert to how navigation is now, else you can leave it on and any albums that have 2 or more discs will show as album -> discs - > tracks.  Albums that are only one disc will go album -> tracks as there is no point showing a single disc if that album is just that disc.

may I please ask for the complete manual howt to create Box-sets node? Or I have missed it somewhere in the previous posts?

You don't need to.  Kodi will create the Box-sets node on it's own if at least one album fits the criteria for a box-set.  So, if you have at least one album that is 3 or more discs and each of those discs has a title (in your tags) then Kodi will automatically decide it's a boxed set and create the node accordingly.

If you want to force Kodi to make a boxed set out of an album (maybe you have a twin disc set that you think should be a boxed set, or MusicBrainz has not yet added any disc titles to your 16 disc set) then you can either -

• Use Picard (or similar tagging software) to add disc titles to each disc
  
• Add 'boxset' to the Musicbrainz_album_type tag.  Thats the one where it says 'album', compilation', 'single' or a combination of those.
  

Using either of those methods, or a combination of both, will allow Kodi to detect your boxed sets and create the required node automatically.  Note that even without that node and any boxed sets present in your collection, Kodi will still navigate to discs -> tracks if there is more than 1 disc in an album unless you turn that option off.  Even if you turn this option off, Kodi will still use disc navigation for any album that is marked as a boxset.  Obviously, you need to make sure that your tags are relatively up-to-date.  On upgrading, Kodi will prompt you that your tags need re-scanning (because it can read more tags than previously) and you should do so if you want it to auto identify boxed sets (or sets that you have added the 'boxset' tag to).

Currently, that's the way it works although this may change before it makes it into V19.  Although the detection and creation of sets is consistent and reliable it might turn out that it needs to be revisited at a later date so don't take this as gospel until there is a proper PR against Kodi's master branch.  Things are very much in a state of flux and both Dave and I are making changes daily.