To facilitate the annotation and scheduling of devices, you can specify property sets and tags in the device tools properties, so that they are automatically attached to the devices added to drawings. A property set is a user-defined group of related properties, such as a part number or a manufacturer's name. A tag is a symbol that can display the data in a property set attached to an object. You use both to annotate electrical drawings and create schedules. You can also manually specify property sets and a device tag using the Properties palette when you add devices.