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1. How an I modify a scenerio without replacing the old one?
2. how do i add kingdoms??

For the first, the simple solution is to backup all the files associated with the old one, and then edit the backups instead of the normal scenario file. For example, you see 1066_scenario_characters, 1066_scenario_provinces, etc. Backup all of those, rename them (and it's important to remember to rename them inside the file as well), and then place them back into your scenario when finished.