url structure( without root of all categories)

Hello
I would like the site to have urls with the name RUB1 or RUB2 that distinguish the subcategories
ndd.xyz/RUB1/ss rub1
ndd.xyz/RUB1/ss rubX
ndd.xyz/RUB2/ss rub1

ROOT
- RUB1
-- ss rub1
-- ss rub2
-- ss rub3
-- ss rubX
- RUB2
-- ss rub1
-- ss rub2
-- ss rub3
-- ss rubY

I tried to put {categoryPath} in Category URL pattern but I don't get what I want.

Is this possible, if so how?
If not, do I have to change the content architecture but then I will lose in SEO?

Regards

HI,
Ok if I understand correctly it is not possible to have the desired url.
I can't remove the ROOT because the home page of the site is in blog mode of all these categories.
The only solution would be to have menu links according to you. If I try, I have the impression that I can't get the desired url. Joomla automatically puts the last category and the parent category!
I may have misunderstood, I started from the menu type modules!

If I get my way, your extension (or any other one) does not allow redirecting old urls by "just" adding a term "RUBx"above the category

Regards

HI,
I will delete a parent category or change the term of a Joomla article category. The title of the article does not change. How to easily do a mass redirect without using rules in htaccess?
Part of the url to change:
/ruba/ by /rubb/
/rubx/ruby/ with /rubxy
If you have a suggestion but I imagine your extension or others would not do this?
Regards