Duplicating content across subdomains
I am looking to clone our main website to many subdomains for different sales agents. Each subdomain will have its own database as it will be unique to that sales agent as far as contact info goes. I understand how to do all of this already. My question is I'm trying to figure out how be able to update all of the subdomains easily if we change content. So if I change an image n the Main site I want it to also update all of the subdomains. What would you suggest?