The New Folder command, accessed on the Home ribbon or on the right-click context menu, creates a subfolder inside the current folder allowing you to organize entities within the class or other objects in the repository. You will be prompted to enter a name for the folder and then the folder will be created.
As with directories within Microsoft Windows®, names within a folder must be unique. The same folder name can be used in different folders, but within a given folder, each subfolder must have a unique name.