Add multiple "Topics" for a sermon

If someone is preaching on a passage, there will inevitably be more than one "topic" that is covered. For example, if I preach on Job, I will talk about suffering more than likely. But I would also talk about the goodness of God or the faithfulness of God. It would be good to choose up to three topics that help to provide some depth to the sermon resources and provide a more robust search by topic feature.