The purpose of this functionality developed in Revit is to facilitate the integration of a BIM classification system into models. This tool allows users to assign classes and organize model elements according to a predefined classification system, eliminating the need for lengthy or complicated manual processes.
Classify allows you to classify your model using the classifications active on your Onfly platform. The only prerequisite that these classifications must meet is that they have at least one property to be selected for save the name or the code of the classification.

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Classification with no name AND no code property will be not displayed in Classify.
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If you want to use BIM&CO public classifications you must enrich your dictionary with the properties used by them.
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To access this tool just click on the Classify button on the Revit tool ribbon.

The time the plugin needs to show you the table depends on the number of instances in your project. In any case, after a few moments you will see the table with all the elements in your model.

Each row represents an instance of the model and each column represents a parameter in the model. By default, the table displays three columns: the family name, the family type and Revit category but you will be able to increase the data displayed if you needed.
Once you've configured the table to best fit your workflow, click the "Classify" button located at the top right of the window. After that you have to choose the classification you want to use.
A message will inform you that a property or properties will be added to the table in order to save the class added to each element. This message will also inform us how the model will be classified (by type or by instance).
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You can check this setting by looking up the property assigned to the classification in the Onfly property dictionary.
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To add a class to each element of the model, simply select the desired entries in the table, choose the appropriate class, and click the "Classify" button at the bottom of the screen. This straightforward process allows you to efficiently assign the correct class to multiple elements at once, ensuring that your model is organized and categorized according to your specifications.