Can I update Network Users from a subdomain

I run a multi-site (using sub-domains) for a sports association.

One sub-domain is used for member registrations and manages new user registrations, user updates and user deletions. I need to be sure that any changes made by a user on the member sub-domain is also reflected on the Network. This includes user deletions.

Does your plug-in allow for this?

The page I need help with: [log in to see the link]