I'm experiencing problems with AI of new sides.

In the file ScirmishScripts.scb" there are all sides (totally 13) and when I try to add a new side into the Player List in WorldBuilder, it won't allow me to add more than one side, so it appears that World Builder is able to create only 14 sides.

Has anyone an idea how to create AI for new sides (perhaps in some different file than "ScirmishScripts.scb") or if there's any other utility for creating AI...?