Tags and sub tags allow you to give customer's filter options. Any tag that has one or more subtags will have its own dropdown menu. For example, a good use of subtags for yoga would be:
Tag: Yoga Type
Subtag: Yin
Subtag: Vinyasa
Subtag: Power
This would present to the customer like this.
To create tags and assign them to videos, click On demand > Video Library > choose a collection > locate a video to tag > click the drop down menu to the right > click Edit > Choose tags from the drop down menu. To create subtags, use the Manage Tags link.
To preview your changes > click Your Page.
Then click On-Demand Videos and Courses.