Calling all DNS experts for help setting up Mojo using sub-domains.

I would like to know the best way to set up my DNS for using sub domains i.e. multiple sites using sub domains.

Right now, anything I type into my browser as a sub domain (anysubdomain.mydomain.com) displays mydomain.com contetn - this must be some sort of wildcard setting by my host, discountasp.net.  I'm not sure about this - anysubdomain.mydomain.com is still in the browser address bar, but mydomain.com is displayed.  This seems to be the behavior I want to use multiple sites with Mojo.

I added a CNAME record for a sub domain (mynewsubdomain.mydomain.com) and have it pointing to mydomain.com.

I'm wondering if this is the best way configure my DNS.  If any subdomain is going to mydomain, it setting up a CNAME redundant?

I am not able to use an A record, because it is add-on charge and I'm not sure if it is even necessary.

Any advice is much appreciated.

I got everything to work properly on DiscountASP.net, but I need to purchase the unlimited subdomain add-on at $5 a month.

Without the add-on, I can't create a wildcard record which will direct all subdomains to my domain.  This stinks, I otherwise like DiscountASP.

I could not create a CNAME record to point a subdomain to my domain either.

Thanks for your help, the documentation is fine.  Different hosts have their own DNS policies, so for DiscountASP.net, you will need the unlimited subdomain add-on for multiple sites by subdomain to work.