First, I don't think you want to drag these new folders into Links. You want to drag them into Favorites.
The Links suggestion above, would only contain the one shortcut that runs Explorer, that would in turn open Favorites in an Explorer Window.
The easiest way to copy???
Open two Explorer windows and then shrink the windows so that both are open on the desktop.
Position one so that Favorites is available, then from the second drag and drop each folder on top of Favorites.
(assuming that these folders will then be "high level" folders within Favorites. That is, when you open Favorites, you want to see these "50" at the next level. If not, then drag and drop the various 50, into the particular folder within favorites. If you really have 50 that you want to move in, may I suggest you create higher level categories in order to make finding these a lot easier. Categories such as Graphics, Sound, Reference, etc., then within these, create sub category folders. Eg: Under Reference, create folders such as Books, Auction Sites, Cars, Search Engines, Sports, Cooking, etc. In this way it "should" be easier to find things. And, you can use Explorer to reorganize these folders and/or urls anytime by just dragging and dropping them into the correct folders)