[defrost]

WizTree can be used to navigate about a subtree,

if you start from File Explorer Navigation Pane and used the default WizTree install then every folder (in File Explorer) should have a right click context menu item that launches Wiztree for just the folder subtree.

if you start from command.com or Powershell then you can pass a subdirectory path as an argument (with a switchy? I don't recall ATM) or make a shortcut comman to launch WizTree for a subfolder.