Hey, @chripede.
Thanks for letting me know. Support should be able to handle general queries like this. Could you share the ticket number so I can reach back out to the specialist?
I may have misunderstood your original request. I assumed that you wanted to replicate your external site’s path structure on a HubSpot-hosted www subdomain.
Re-reading your post, I now think you may have been asking whether it is possible to place HubSpot CMS content on your externally-hosted www subdomain, alongside content published through your other CMS. This is not possible with a proxy server for the reasons I mention above.