You need to have ObjectDock Plus https://www.stardock.com/products/objectdock/ to create tabbed docks.
Once installed, you can create new tabbed docks by going to the "My Docks" dialog (reached by using the System Tray icon's context menu, or by clicking the button on the lower left of the Dock Settings dialogs).
The rest is self-explanatory for the most part.
Post again if you have problems.