Installed WordPress Location

Basically yes, but you’ll have to ensure that your sub-domain’s document root set to the correct file location so that it picks up your WordPress files correctly. Then you’ll have the WordPress Site URL, which I assume would be: mydomain.com Then you have the WordPress URL, which would be your sub-domain. You’ll just need to … Read more

new subdomain to apply as main domain

You will need to modify some values directly in the database in order to change the url of your primary domain. The values in the following tables needs to be modified: wp_options, wp_site, wp_sitemeta, wp_blogs and wp_#_options Try this link it has all the steps involved in detail

Multiple domains showing same content

There are several problems in your logic, as WordPress won’t know which domain is going to handle actions. Even if you use a symlink from the other domain to point to .com domain, or even if you use htaccess rules to redirect requests, when a user upload some image, will they be saved as .com.au … Read more