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Sorry, I don't think so. I believe our assumption about workflow was that you would first export the default CWP files, modify the ones of particular interest to you, and then import those into the appropriate Login page settings, Success page settings, etc.
However, for your current situation, you should be able to just go into, for example, the Captive Web Portal Login Page Settings, hit the Modify button, and be able to modify your current files.