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Synchronizing Taxonomies 
When you define search queries, the queries are stored in Content Management (category assignment) and in TREX (index assignment).
When you start synchronization, the system transfers all search queries from Content Management to TREX.
When you create an example-based taxonomy, the system creates a property with the name of the root folder of the taxonomy in the index parameters. You can display this in the TREX monitor (TREX Monitor ® Display Index Entries ® Document Properties). For more information on index parameters, see Displaying Index Parameters.
When you start synchronization, the system creates this property as long as it is not already available.

When you reindex an index, the system also always carries out the synchronization of the taxonomies between Content Management and TREX.
From the Index Administration iView, open the Details dialog box for an index and choose Taxonomies. Select one or more taxonomies and choose Synchronize.