This free tool from Autodesk will allow you to quickly apply data from multiple classification systems to all your elements
Classifications Out of the Box
A robust database is included with several major classifications systems and mappings across each.
Use a Custom Database
Use the fully customizable database systems to support your own custom databases.
Works with the COBie Extension
Integrated with the Autodesk COBie Extension for Revit to assign classifications for your COBie deliverables.
The Classification Manager is free to download and use, just select your Revit version and get started.
These videos will help you understand the featues of the BIM Interoperability Tools and learn how to use them.