How to show up the custom column in grouped meta

Actually I managed to show it like this, this is in functions.php:

/**
     * Registra admin columns Nuovo METODO
     */
    add_action( 'admin_init', 'et2018_add_custom_columns', 20 );
    function et2018_add_custom_columns() {
        require_once get_template_directory() . '/template-parts/admin/customcolumn-nuovo.php';
        new et2018_Custom_Admin_Columns( 'post', array() );
    }

This is the file I require:

<?php
    /**
     *
     * TODO Inserire codice per le colonne
     */
    class et2018_Custom_Admin_Columns extends MB_Admin_Columns_Post {
        public function columns( $columns ) {
            $columns  = parent::columns( $columns );
            $position = '';
            $target   = '';
            $this->add( $columns, 'column_id', 'Column Title', $position, $target );
            // Add more if you want
            return $columns;
        }
        public function show( $column, $post_id ) {
            switch ( $column ) {
                case 'column_id';
                    global $post;
                    $passaggiocantina = get_post_meta( $post->ID, 'gruppo_cantina', true );
                    if ( isset( $passaggiocantina['et2018-quantita_birra'] ) ) {
                        $quantita = $passaggiocantina['et2018-quantita_birra'];
                        foreach ($quantita as $quanto){echo $quanto.'-';}
                    };
                    break;
                // More columns
            }
        }
    }

Actually it works, is it the right way or there is a better one?

Is there also a way to correlate values?
My metas are in Italian, anyway what I am working is something like an Inventory for beers in my cellar (I am a pub owner).
Cantina is the italian word for cellar.
Let's imagine we have a beer named (nome_birra): Cantillon Gueuze .
This beer can have 3 different sizes (formato_birra):
37.5cl / 75cl / Magnum
But it can also be from a different batch (annata_birra) so we can have as an example:
37.5cl -2013/2015
75cl - 2017
Magnum - 2014
So I can have different amount of bottles for each size and batch (quantita_birra):
37.5cl - 2013 :1
37.5cl - 2015 :3
75cl - 2017:5
Magnum - 2014: 2
And each combination has obviously a differente price (prezzo_birra).
So, how can I create such a multidimentional array and then show the values in the custom column?

Can I clone a group?
var SIZE has defined values (37.5cl/50cl/75cl/magnum/keg)
but inside same sizes I can have different batches and these aren't fixed values (we are talking about a huge craft beer cellar where some beers are from 1999/2000/2001/2002....)
Obviously any combination has a different price and availability.
So if I was able to do something like a multidimensional loop (pseudo code ahead):
foreach ($size as $sizes){foreach ($37 as $37s){2017=10€=10;2015=12€=5;2013=15€=3};};
It would help a lot, maybe a conditional 'clone' or something like that?

This is the code I used while the date where in string (before all the group madness) to retrieve the meta_key_value.
It echoes the value in a new column inside edit screen and also let me modify It using quick edit.
The problem is that it can't work with my actual configuration.
Anyway, here is my code:
https://pastebin.com/ZqvmHcye

And this is the code I use to generate metaboxes. I've added a couple of comments to try to explain what I would like to extract and being able to modify.
https://pastebin.com/4BgTUcRM

Do you think is there a way to rearrange old code to be compatible with the new one?
Thank you.