Okay Update, I found the publish project in the drop down menu so now the only question is how to integrate it within the existing campaign. I also assume I at least need to load the Data of the actual story project which I didn't do before.

Essentially I want to add the characters to an existing level such as FortJoy or ReapersCoast but can't figure out how.

I don't think I would need to copy the entire campaign and make my changes to it because that would be a bit overkill.