smittyatthebeach

You can do it several ways.

First you could spin up a new site within IIS.

or

You spin up a new web sever (or outside hosting company) and point the DNS for your sub domain to the new server (or hosting company).

It’s true the auto installer will generate the config for you, but if you have manually create the config, having a bit of PHP knowledge is helpful.

It could be written a little better, but then again the auto installer is good enough for most.