In Dreamweaver, if you have Defined your Site(Site>Define Sites), you can simply right click a folder, select copy, the right click the directory you would like it copied to and select paste. This will give you a folder entitled Copy of MyFolder. You can right click and rename to anything you want.
If the broken links are all going to be the same, for example if <img src="images/ would need to change to <img src="images2/ for all the pages in the folder you can use the Find and Replace option within the code of your pages and select images to be replaced with images2 for either the entire site, the current document, selected files and folders, or a particular folder.
To use this option just open one of the many pages that will need to change, view in source mode, highlight the code that needs to change i.e. 'images'. Go to Edit>Find and Replace. This will allow you to type in the code you wanted changed i.e 'images2'. Select where you want this code changed. Entire Document, Particular Folder etc.
This will change all of the pages you need at one time. Hope this helps.
Tim
