I want to be able to use multiple subdomains in umbraco cloud.

The idea is that subdomain1.domain.com would look for the subdomain1 node and pull out the site logo and title from there, and subdomain2.domain.com would look for the subdomain2 node and pull out the site logo and title from there.

First question is what is the best way to do that on my live environment? Use Umbraco hostnames?

Secondly, how can I achieve the same thing on my local version which runs on IIS Express on Localhost:2272?

I tried changing my local version to use IIS and set up IIS sites including the subdomains, but horrifically, going to the new url in a browser has trashed my local site, initialised it and asked me to download content from Umbraco Cloud from scratch again.

Can anyone explain how that works and why accessing the same site with a different url would do such a thing?

Thanks

Rich