Symbol: 
Function: This command opens a dialog box for defining a new folder in the Devices or POUs view.
Call: “Project” menu, context menu in the Devices or POUs view
You cannot structure the arrangement of device nodes and device objects through folders that you have created yourself.
This command inserts the folder below the object that has just been selected in the tree. If no object is selected, CODESYS inserts the folder right at the top in the tree directly under the root node.