How do i Setup SEO for multiple domains in my multi-domain setup.

I have 6 domains pointing to my main site which customers can sign up to.

my main site if listed on seach engins but rest dont come up how do i set up SEO for remainer of domains which out giving all admins access to Infinet SEO?

I have created a new site for each and want to promote this site and domain.

but only way i can work out how to do it is to allow all site admins access to SEO which i dont want to do.

any suggestions.