From the FAQ (https://docs.broadcom.com/doc/vmw-certification-faqs)
Q. I have multiple accounts. How can I have them merged? A. Candidates can submit a support request via https://support.broadcom.com/. Alternatively, candidates can submit the form at https://broadcomcmssoftware.wolkenservicedesk.com/web-form. List any possible email addresses you may have and indicate which account you would like to keep as your main account. If you currently work for a partner company, we highly recommend that you keep your partner account as your main account so you will not lose your partner privileges.