CMSBundle | Base Bundle of Smart Core CMS | Content Management System library

I'm making a bundle in Symfony 4, but in my bundle I use FOSUserBundle. So I would like to defined configuration for FOSUserBundle from my own bundle and not from the main configuration. How to do it ? It doesn't recognize the node

There is no extension able to load the configuration for "fos_user" (in C:\wamp64\www\MyProject\src\CMSBundle\DependencyInjection/../Resources/config\fos_user.yaml). Looked for namespace "fos_user", found none

And if I load the configuration of FOSUserBundle (FOS\UserBundle\DependencyInjection/Configuration.php) in my CMSExtension.php

I'm getting this message

The child node "db_driver" at path "fos_user" must be configured.

Structure

I am working on a project based on Symfony 2. I have registered a listener like so:

I can't figure out how to do this using the query builder in Doctrine:

On a high level, I wan to fetch all of the userTags which are associated to each user, and I am fetching each user from user relationship table by their parent id.

Something like this: from UserRelationship -> get users by parent_id -> also get each user's associated userTags. It's the last bit that I can't get the userTags. Idealy I would select only the id and name params from that table, as the rest, like company and users is redundant.

I have this query builder query in Symfony 3.* Doctrine 2.*

I got multiple bundles with different dbal connections and experience a problem within the mapping configuration.
Here's the error :
The class 'Mine\DocumentationBundle\Entity\Category' was not found in the chain configured namespaces Mine\xDb\Entity

config.yml:

I have a OneToMany relation between two tables 'user' and 'profil' (a user has one only profile, and a profile can be asseigned to many users) I'm getting this error whenever I try to update the schema in doctrine console.

here is my two entities :

I'm using symfony assetic to manage javascripts & css assets (minify & merge all to 1 file)