Custom taxonomy terms added in admin menu

Hello everybody and thanks in advance for reading my request post.
I’m working on a website that is actually a catalog.
The catalog itself is this:
– 8 main categories
– every category has subcategories
– every product belongs to a subcategory.
All seemed really simple. I decided to create 8 custom taxonomies and relatively 8 custom post types.
If a product belongs to a subcategory, the post belongs to a term of the taxonomy.
In the admin menu I can see my custom post types and the taxonomies.
In the write edit panel I can see the list of the taxonomy terms.
How can I show this latter list in the admin menu so that I can choose a post from a particular term and edit it or add a new post?

I’ve been able to add a menu item to the custom post type menu, but the twos are not related.
This is an example: the custom post type is ‘Safety’ and the term is ‘Wheelchair’. I can add a new post under ‘Safety’ and assign to it the term ‘Wheelchair’ and all is ok.
If I add a post under ‘Wheelchair’, this is not listed under ‘Safety’ posts…

Thank you.