From the Autodesk App Store:
The Classify for Autodesk® Revit® Add-In provides you the opportunity to easily check, change or add Assembly Codes to objects in a Revit model.
The elements are grouped in a list by category and type. When a group or item is selected the element(s) are selected in the Revit model.
You can select any uniformat classifications file you want.
About This Version
Version 1.0.11, 5/19/2017
The Classify add-in is brought to you by CAD & Company. It’s priced at 50.00 USD.