Lotus Domino Mail Hub Servers

Hi,We have 5 regions and every region we have 2 cluster servers.All region using same domain name. HQ we have perimary sevrer. HQ we have one mailhub server for mail routing. I want to install mailhub servers in region for mail routing to external sources. And each and every sector mails needs to route though thier own mail hub servers without come to HQ mailhub.

How can I create it?