Please note this is NOT possible - despite common knowledge that it is. It
might be that in the past you struck lucky and got the movement that you
wanted.
The common situation players use it in is when they are in command of an
army (or about to be). So just in case they are not the army commander they
do an 810 order, but should they be the army commander they put the 2nd
order in as 860.
This does not work and we'll just have to not input the 2nd order if we
don't get corrections - so my advice - save yourselves the time and effort
and only put one 8xx order in.
Thanks
Clint