Move blog to new subdomain on same host

My blog is currently at https://examplehost.com/blog. I just purchased a new subdomain with the same host, and I want to put the blog in the root directory of that subdomain (i.e. https://newsubdomain.com).

How do I do this? I’ve seen instructions for moving from one directory to another on the same host, but not from moving from the main domain to a subdomain on the same host.

Thanks.