Forward Domain Page to Subdomain of Same Domain Hosted on Different Server

I have my domain gambrelmarketing.com hosted on dashnexpages.net as a subdomain.

I also have email for gambrelmarketing hosted on floathosting

The Namecheap registrar DNS points to Cloudflare’s servers.

I have a subdomain of gambrelmarketing set up on floathosting.

I set up Page Rules for page html-templates-for-free on gambrelmarketing to be forwarded to a different URL – the subdomain of gambrelmarketing.

Since gambrelmarketnig isn’t registered with Namecheap as being on floathosting servers, this gives a 404 error.

What I would like to be able to do is forward page html-templates-for-free on gasmbrelmarketing to a page on the subdomain hosted on floathosting.

Is this possible?

Thank you,

Jim