I created a booklet of 45 pages.  Each page was created separately.  I want 
to edit the booklet, but don't want cut and paste from page to page.  How can 
I link pages with existing test in Publisher?

First of all, booklets are setup in groups of four, you'll have a lot less grief if you add three pages or delete one page.
That said, you can use the page tabs on the status bar to move pages around. Right-click, click move page, a message box will come up, you can select where you want the page moved. Sometimes it is helpful to rename pages.