If you are a first-level subcontractor and you are going to subcontract to a second-level company, you must register the second-level company through the subcontractor registration form (or request registration from the main company in the event that they are the ones who directly manage the platform).
If you need help on how to register a company, you can read this article.
Once the second level subcontractor has received the access codes, you must generate a ticket through the chat to create the relationship so that you can see the company you have subcontracted and its documentation.