Map Subdomain to other website

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@jmsherry

using a DNS CNAME record using Netlify DNS

If you’re using Netlify DNS you should not have a CNAME record for this. You should have a NETLIFY record.

@jmsherry

I want to set up a sub-domain https://student-portal.thejump.tech to aim at the URL https://student-portal-the-jump-portal-team.vercel.app/ (obviously offsite on vercel).

Accomplishing the above has nothing to do with

@jmsherry

I have read the redirects rules but am not totally sure of the best way. Do I need to add a _redirects file to the root of my netlify site?

@jmsherry

I tried adding a CNAME DNS entry for the subdomain that aimed at the vercel site but that didn’t work.

You need to look through Vercel’s documentation on adding a custom domain to a site and the record(s) required to accomplish this.