GoCentral website - multiple admins?

I have several different domains and several different GoCentral websites using Website Builder.


Can I assign someone else (possibly multiple people) to have administrative rights ON ONE OF MY SITES ONLY?


To be clear - I can see how to "delegate access" to another user, but this gives them access to my entire account including all domains, email, etc.


I want to be able to allow someone else to edit one specific site, BUT NOT have access to the rest of my account.


How can I do this?