The word you may be looking for is "crop marks," but they are something
different. AFAIK, there is no special name for marks to indicate folding,
but adding them isn't rocket science. It requires a ruler and the drawing
tool. Fold a sheet of paper as desired, measure where the marks should go,
then use the line tool to draw lines where they're needed. If you have more
than one page and want these to appear on every page, open the header before
you draw the lines (so they'll be anchored to the header paragraph), and
they'll repeat on every page.
Be aware that there is an irreducible unprintable area around the edges of
the paper. This is usually pretty small (0.25" or less) on the sides, but
the marks will not print in that area, so be sure to make them wider than
that or place them entirely inside the printable area.
--
Suzanne S. Barnhill
Microsoft MVP (Word)
Words into Type
Fairhope, Alabama USA
http://word.mvps.org