In the tutorials we have given the examples. You may fill the tags as per your requirements.
Yes you are right...
As per MARC 21 082 tag is used for classification and item part of the materiel. If you fill 082 tag and sub tags properly, full call number automatically displayed in Item part following MARC 21 tag 952$o.
To do the same you need to clearly define classification part of the materiel in 082$a tag
and for Item part in 082$b tag.