How to enable Subscribers to synchronize with alternate synchronization partners (Enterprise Manager)

1. In SQL Server Enterprise Manager, expand the Replication and Publications directories, right-click a Publication, and then click Properties.
   
   
2. Click the Sync Partners tab, and then enable Allow Subscribers to synchronize with other partners than the Publisher from which the subscription was created.
   
   
3. Enable the Publishers and Subscribers that can be alternate Publishers for Subscribers to this publication.