How do you create Inboxes within Inboxes

Hi guys, in recent times my email accounts have increased in number due to several different ventures of mine however managing has become a little untidy.

I was initially in the hope that I could organise them all via iCloud however I have been told by an Apple advisor this is not possible and I need to continue using Mail or any other platform that allows what I want.

As a result I decided to stick with Mail however its very annoying that a. I need to set all my accounts and mailboxes on each individual device of mine (all of which are part of the Apple eco system) b. Having several ventures some have multiple email addresses which I would like to organise in Sub folders (sub inboxes).

So for example I have 3 companies (just a made up example). Green Apples Limited, Awesome Laptops Limited and Macintosh Skincare Limited. The companies have the following email addresses:

Green Apples Limited: Info@greenapples.com

Awesome Laptops Limited: info@awesomelaptops.com, sales@awesomelaptops.com

Macintosh Skincare Limited: hello@macintoshskincare.com, enquiries@macintoshskincare.com, complaints@macintoshskincare.com

What I would like to do is create one primary inbox for each of these companies which I believe shall have to be under default Inbox as this cannot be removed as a root folder.

Thus I would like to have the following Inboxes with their respective sub inboxes but the sub inboxes shall have their own Mail Accounts linked to the relevant email addresses named above.

Green Apples Limited (no sub inbox as there is only one email address)

Awesome Laptops Limited > General/Sales

Macintosh Skincare Limited > General/Enquiries/Sales

So the primary Inbox does not have an account linked to it direct but rather is a primary folder to house each of the accounts related to that business.

I am hoping this makes sense.

Please do share some knowledge

Whilst at it please also explain how I can set these Mailboxes in as little steps as possible on my new MacBook Pro as the setup is a little more tidier on the iPad Pro than my older MacBook Pro.

Thank you