To register multiple companies, log in to your Extranet Declarant account. 

From the home page, click on "Create a company" (at the bottom of the page) to add a new company to your account.
 
You can find all the steps for registering a company in our tutorial. 

To declare multiple companies from the same account, they simply need to be linked to the same declarant profile.

Each brand or company has its own file on the Extranet, linked to the declarant's profile. If the same declarant profile is entered for several companies, the declarant will be able to access all of the companies by logging into their Extranet space.

You will then need to go to each company file to make the associated declaration.