You can easily create a scenario using a map from your quick battle maps, or a map from a scenario, or even on the featureless default map that the scenario editor opens on by default (though you might want to change the size).
Pick whatever forces you want for both sides, deploy them where you want them, and save it with an appropriate name.
Then go to battles, select it, and play it as 2 player hot seat, so you can control both sides.