How do I copy content between classes? (Details below...)

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I have two academic history classes. I do not want to combine them into one shell. However, how can I copy a single lesson from one class to the other? I don't want to recreate the same lesson in the other class. I've tried using the import/copy feature but it only allows me the option to copy the entire class content.

To be clear, I don't just want to copy a file, but a lesson that has instructions and links that to connect and resources.

Does anyone know how to work around this?