Master Folders allow you to filter Projects and Issues based on what folder they are located. Custom Fields are generally more useful, but this feature still exists in Project Insight. Legacy...
A sample of selecting Master Folders in a report
Setting a Master Folder
After naming your folder, the second field is a checkbox to make this folder a master folder:
Folder - Add options
Selecting this checkbox will display the name of the folder in the Master Folder filtering options seen on the following reports:
- Project Report
- Cross-Project Gantt Chart
- Issue Report
You will not be able to check this checkbox if a parent folder is already a Master Folder.