I have two different project deployed right now, project A and project B. My main domain, let's say example.com is connected to project A.

Now I want to deploy project B in example.com/portfolio as a subdirectory, so I was taking this approach where I located vercel.json in the root directory of project A.

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{
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    "rewrites": [
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        {
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            "source": "/portfolio/",
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            "destination": "https://project-b.vercel.app/"
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        }
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    ]
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}

Is there any steps I'm missing here?