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Importing a redesign into an existing project

So I’ve been attempting to redesign my portfolio. My intention is to build it as a whole new project and then switch it with the old portfolio when I finished. I misunderstood my pricing plan and can only work on one project at a time. My question is: Is there an an easy way to essentially copy my work on the new project over the to old one or do I have have start from scratch and build it again?