Setting up the master site
Log in to the site that you want to make the master site where the shared tables will exist for the intranet. Then follow these steps at that site only:
Note: Use a site, not an entity, as your master site.
Note: In a cloud environment, never select the Intranet Licensing option.
Note: After you define the master site for an intranet on the master site's Intranets form, the master site name displays, but cannot be changed, on the Intranets form at all other sites. (This assumes you have set up replication of the Site Admin category from the master site to the other sites in the intranet, or the sites are in the same application database.)