Managing the larger scenarios

[Nitram Draw]

I play the large scenarios solitaire all the time. I break them into fronts as suggested above. It makes it easier to remember what is going on. If the map gives you natural dividing lines, like rivers or forests I use them. Other times I use a high level command, like an Front or Army grouping as a mental bookmark.
I can generally do a turn or two a night, sometime more when night comes. I do wish the AI orders worked better. It takes the craziests routes to get where you want it to be.