How to sign a root authority with a lets encrypt certificate?

Question

System administration

Greetings, please tell me how to implement the following,
I want to raise a certificate authority in an enterprise based on Windows Server 2012, and I want to sign it with a let's encrypt certificate so that it becomes automatically trusted within the enterprise, how to implement this? Will my center be the root or sub-center?

Answer 1

• Root certificates are by definition self-signed
  
• Let's Encrypt does not issue certificates with the right to sign/issue others.
  

Answer 2

First answer your question: If it were possible, then who would buy certificates from Comodo, Thawte, Symantec etc.?