Understanding Interests and Centers
Both Email and Web Interests that you create from within the context of a Center are automatically categorized according to the Center in which you are operating. That is, those interests will only be visible to members of that center* and can only be associated with objects in that center. In addition, any opt-in or opt-out groups that you create for those interests will also be associated only with that center.
You will also have the option of making any Center Interest a default interest for all members of that Center, as shown:
If an interest is designated as a default interest for the Center, then new constituents that are added to the Center will be assigned this interest.
Additionally:
Both Web and Email site-level interests in the General category will be available to members of each Center.
For MultiCenter-enabled sites, the constituent-facing "Special Interests" page will display only Web Interests, while Email Interests will display on the new Email Preferences page. Likewise, when an administrator accesses a constituent Profile, the constituent's Web Interests will be on the Interests tab, while their Email Interests will be located on the Email Preferences tab.
By default, constituents assigned an interest associated with the security category of a Center are also automatically added to that Center's Member Group. (This is a site option that can be disabled by an administrator upon request).
It is possible to configure your site (and individual centers) so that you display Email Interests to constituents for centers where they are not a member (giving them the opportunity to select those interests and thus become members of additional centers). See Displaying Email Interests to Constituents for more information.