How to add an existing Vultr account as a sub-account to your primary Vultr account through support assistance
You cannot directly attach an existing Vultr user account as a Sub-Account through the Vultr Customer Portal. However, Vultr Support can assist with this process upon request.
To link an existing Vultr account as a Sub-Account:
Once approved, the target account will be linked as a Sub-Account, and billing will be managed centrally by the Parent Account.