I created the artwork that is required to satisfy the
requirements of the letterhead template. The header
section of the template is filled with a JPEG image. Then,
a frame was superimposed on the image allowing for easy
variations of text content in the letterhead. Everything looks
fine except that the header section required page margins
that really aren't desirable for the document body. E.g.,
the header section is 8 inches wide while that isn't normally
an appropriate column width for the body of the document.
Is there a way to have different margins for the header than
that of the body?

Thanks,
Bill