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You cannot directly edit the core data for a game system. Instead, you can create a replacement for the core content. This is done via the integrated Editor. Using the Editor, start by creating a new thing that is a copy of the thing you want to modify/replace. Give your new thing its own unique id and make the appropriate changes you want. The final detail is to enter the unique id of the core item being replaced into the Editor field labeled "Replaces Thing Id". When you save and test your thing, it will be used *instead* of the built-in thing it replaces.
This approach ensures that your changes are completely separate from the core data files, which means that you don't have to worry about updates to the core data files clobbering your changes. Using this technique, you can fully replace core content with your own mechanics.
Also, when you replace built-in content, all references to the built-in thing are automatically pointed to your new replacement instead. For example, if you replace the Longsword in d20 with your own version that has different damage, all magic swords throughout the data files automatically refer to your replacement, so they all inherit the new damage. The same would apply to any disciplines or merits that are referenced by other elements in the data files.
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