Case labels are used to provide a title and description for cases, so they can easily be identified in a list of cases. System and case variables can be inserted inside these labels to customize the information. Users can search for particular cases using the case titles and the case descriptions that are displayed in the "Case Summary".
So with this feature you can easily add more information and data to the cases list in Cartabel and search for them.
For more information, visit the following link:
https://wiki.processmaker.com/3.0/Tasks#CASE_LABELS