Download this program.
http://cmmodsiii.greenasjade.net/?p=5186&
It will allow you to split existing campaigns into seperate scenarios. Place the BTT-files in your QUICK BATTLE MAPS folder (user/documents/battlefront/quick battle maps) and load them into the scenario editor. Remove the force selections and tweak other stuff like objectives, time, weather, set-up zones to what you like and re-save it. I think this ought to work...If your maps are ment for PBEM QBs only then you will not need to add (or remove) any AI-plans IIRC.
Instructions how to use the program comes with the download and if you are not familiar with the editor your best bet for learning how to edit things like time, weather and removing units would be to check out the manual i belive. It is very well described there...
