Hi @studio,
Welcome to the Auth0 Community!
I understand that you would like to set up multiple child tenants under your current subscription plan at Auth0.
As you have discovered, you must have a subscription plan that is more than $167 per month to be able to request a child tenant.
Given that you are paying $240 per month, I suggest reaching out to Auth0 Support where one of our Developer Support Engineers will be able to help you with a child tenant.
Please see our How can I request a child tenant? FAQ to learn more.
Hoped this helps!
Please let me know if there’s anything else I can do to help.
Thank you.