i was messing around with rome total war and in the files i found this
if this crashs your game not my falt use at your own risk
heres a video go to the commnets it wont let me post it in the Descripton so it in the commnts
https://www.youtube.com/watch?v=GJOIzNqguv4
right click rome total war alexander
click on preferences
go to set launch and then type enable_editor
hit enter
close preferences
click on play rome total war alexander
go to optians
click on battle editer
and the rest you do
then you can make a map
(this also works on the base game and barbairan invasion)