In All Centers mode, you can automatically syndicate published alerts to Centers that have been configured to receive them.* Once the ability to send alerts has been enabled within a Center, that Center can also syndicate alerts to other Centers that have been configured to receive them. The procedure for syndicating an alert is the same -- whether syndicating from Advocacy in All Centers mode, or syndicating from Advocacy within a Center that has been configured to send them.
Note: *You will not be able to syndicate (send) alerts unless at least one Center has been configured to receive them.