If you're desperate enough to read the manual, it
can be found here:
IC-M710 Downloads - Icom America
I believe that the 710 has a proprietary data port which allows an ICOM
dealer to configure the presets all at once. Might be easier to take the
to the dealer than to key in your own presets.
FWIW, I found it very handy to set up my own set of weatherfax
frequencies so that I could rotate through them looking for the