Illustration reptree.gif shows the Replication Management tool navigator tree structure:

Advanced Replication object (top level)
  Administration object (under Advanced Replication object)
  Multimaster Replication object (under Advanced Replication object)
    Master Groups folder (under Multimaster Replication object)
  Materialized View Replication object (under Advanced Replication object)
    Master Site object (under Materialized View Replication object)
      Master Groups folder (under Master Site object)
      Materialized View Logs folder (under Master Site object)
      Templates folder (under Master Site object)
    Materialized View Site object (under Materialized View Replication object)
      Materialized View Groups folder (under Materialized View Site object)
      Materialized Views folder (under Materialized View Site object)
      Refresh Groups folder (under Materialized View Site object)

Each item in the tree has a plus/minus control that enables you to expand or collapse it.