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# Create Categories from Legacy Topic Sets

You can use the `CategoryImportFromTopic` action to import categories from existing legacy topic sets. The IDOL Category component creates one category for each topic set. When you import a topic set, you can specify whether you want to maintain the original Boolean rules of the topic, or import the topic as an IDOL concept matching agent.

All categories that you import from legacy topic sets are child categories of the `root` category. You can move them to create a hierarchical structure. For example:

    action=CategoryImportFromTopic&Topic=MyTopicFile.otl&BuildNow=True

In this example, Category imports the topic sets that are stored in the `MyTopicFile.otl` to categories in the `root` category. The `BuildNow` parameter instructs Category to build the categories immediately, so that they become active. You can also activate the category at a later point by using the `CategoryBuild` action.

Related Topics

- Build Categories

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