Not sure which forum for sure to put this in…
but…
I have a mod right now and I am trying to figure out how to make a map for a game beforehand and save it so I can load it up for any game in that module…
If you want to add a new map image, first create it in an image editor (like Photoshop, Illustrator or Paint.)
If you want to allow players to select the map that loads at the beginning of the game from a list of maps, then open the module in the Editor.
Find the main map window entry, that has the default map. Under [Map Boards], right-click and pick Add Board. Add your new map image here. Save the module. Close out the module and re-start.
Now when you load the module to play, there should be a drop-down list that lets you pick the board to play on–either the default one the module came with, or the new one you added.