Loading a copy of my subdomain to another subdomain

I want to create a second subdomain that has the same content as my first subdomain. This is to split the functionality of the first into two subdomains that have different functions and code - and be easier to manage.

I created a COPY of the first subdomain according to Webflow U.
I created a subdomain, got the DNS working at GoDaddy and
I have a site plan in Webflow.

I have not been able to figure out how to transfer the COPY of the first subdomain into the new subdomain.

Help would be appreciated. Thanks

my read only link:
https://preview.webflow.com/preview/admin-helps-austin-9b22c-3b2a1deb287132?utm_medium=preview_link&utm_source=designer&utm_content=admin-helps-austin-9b22c-3b2a1deb287132&preview=5521d1d2a60146b4b7d72ad60229f69a&workflow=preview