Thanks for your response woodchip, I can cut and paste the text that flows onto a second page and print second page from new doc, then restore text to original letter, but other uses of the PC find this tricky and want to be able to print a two page letter onto two different margin setups in one go.
Where are all the Word users this morning? I also don't use it. As I recall, you have to start a new section for page two. Another way would be to define a blank header that "prints" only on page one, but there must be an official way to do this routine task.
When you have set up your front page letterhead insert a page break INSERT> BREAK NEXT PAGE for example. Then with the cursor at the top of this second page go into setup FILE>PAGE SETUP and alter the margins to suit. At the bottom of the margins tab there is a drop down box SELECT FROM THIS POINT FORWARD and then click OK.