Multiple WordPress Blogs One Dashboard Setup MultiSite
Today I am setting up a new website that is going to have about 20 different subdomains, each with their own blog about a certain subject. Prior to WordPress 3, you had to use a plugin called WordPress MU (WordPress Multi User or short WPMU), that was then renamed WordPress MultiSite and integrated into WordPress.
To activate the support for multiple blogs/subdomains/domain names, all you need to do is add the following line to wp-config.php, above where it says /* That's all, stop editing! Happy blogging. */. If it doesn't say that anywhere, then add the line somewhere above the first line that begins with require or include:
Next you login to your Dashboard and click on: Tools/Network Setup
Here you have a few option, it's all pretty much self explanatory. I chose "Sub-domains" for Addresses of Sites in your Network.
After verifying that the settings are ok, click on the "Install" button, and follow the instructions given in the next page to modify the wp-config.php and .httaccess files.
Once you've modified the files, login again, and you will see "My Sites" in the top menu, click on "Network Admin" in its sub-menu to manage and create your blogs and users.
That's it… should take a couple of minutes.
Enjoy 
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