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I want to add a subdomain to all my WordPress sites in a WP MU.

For example, I have: example.com. When adding a new site to be: demo.example.com/newsite1

I don't want to create a new user or WordPress Installation.

Is this possible?

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Yes, with domain mapping and a compatible hosting account. There are a few good domain mapping plugins available that may work for you with a little configuration. I have used Domain Mapping pluginby Barry, as well as WordPress MU Domain Mapping. There is also the Multi-Domains plugin from wpmudev, which allows the creation of subdomains at your primary or mapped domains. Details are available at premium.wpmudev.org/project/multi-domains/ (sorry, stackexchange won't let me provide more than two hyperlinks in my answer). You can also always try visiting the WordPress Plugin Directory or hitting Google for other options.

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thanks but I think there must be a .htaccess hack, or some php codes, I'm currently searching and trying to do this... – user1502679 Aug 14 '12 at 2:55

yes when you create the subdomain it will be under your login.

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how? should I edit my .htaccess file too? – user1502679 Aug 14 '12 at 2:33

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