Labels fall into the following categories:
Filter labels (also called dynamic labels) use specific criteria to define a group of devices. Manual labels have no criteria associated with them; you select each device associated with a manual label.
When you initially create a label, it is stored as a filter label. If you use the Advanced Search feature to specify the criteria for a label, then it remains a filter label. Otherwise, if you select devices in an Admin Portal screen and apply the label to them, then the label becomes a manual label.