website pointing

I miss a function like “website pointing” in virtualmin or i have a different perception about it:

for example, there is a top-level virtual-server called {myweb}.{tdl}
this site is stored under default /home/{myweb}.{tdl}/public_html
and is reachable using www.{myweb}.{tdl}

For testing purposes, a copy should now be applied here: /home/{myweb}.{tdl}/public_html/test01

Now my question:
Where can make a reseller some “settings” so that this folder is accessible using test01.{myweb}.{tdl}

Any ideas or hints?

best regards