New Stack Linked to a Folder

Add a stack that links to a folder structure.
Check "Include Sub Folders" option to links to a folder structure and its subfolder.
Shortcut: [Control] + "N"
Menu: File/Add Folder

New Stack

Add a virtual stack.
Shortcut: [Command] + "N" OSX Only
Menu: Stack\New Stack

New Smart Stack

Add a smart stack.
Shortcut: none
Menu: Stack\New Smart Stack