how to show variant items attached to one Catalogo entry / additional 'not listed in Catalogo'

[lightgivener]

Hey,

The https://cicognara.org/catalog/40 is a great example for having several variant items that were assigned the same number / assigned to the same Catalogo entry but are not just volumes.

Cico No 40 has one full set of the 3rd edition 1809 as listed in the Catalogo and then another full set of the 4th edition 1815 that was never listed in the Catalogo but entered the Vatican as part of the collection and was assigned the "next best" number.

The way it is now is pretty confusing with several viewers and several records below.

Can we discuss the option of creating subsections or whatever you would think would work best?

Cheers!