Content channel items can have child items. These child items can be from other channels. For instance, the podcasting feature in Rock uses this capability. The 'Podcast Series' content channel items are configured to have child items from the 'Podcast Messages' content channel. This concept is powerful as it allows the series items to have their own attributes and settings, yet they can work together to create robust applications. When adding a child content channel item, you have the ability to select an existing item, or to create a new item. This is helpful as it minimizes the amount of clicking required to add child items. Keep in mind that a single channel item can have more than one parent. Child items can also have their own children. The sky's the limit on what you can create.