On the Drawing toolbar, click the Select objects button, and then drag
to select multiple text boxes. Copy them and paste at the desired
location. You may have to insert a page break to force a new page.

Note, however, that it might be easier to use newspaper columns rather
than text boxes to create a newsletter in Word. The document will be
easier to manage, but, of course, you'll lose some functionality (such
as using linked text boxes to flow text from one page to the next).