Use Google. Your answers are there. There are many paid plugins out there which will be able to help you with this task, but if you don't like the look of them you could even post in the BST area here to see if you can find a developer to help code one to your needs.
not sure exactly what you need this may help http://wordpress.org/extend/plugins/multisite-plugin-manager/
The latest version of wordpress offers multi site creation, check the manual in the codex http://codex.wordpress.org/Create_A_Network
This is built into the WP system already. Check this out: http://codex.wordpress.org/Create_A_Network
You will get help chttp://ottopress.com/2010/wordpress-3-0-multisite-domain-mapping-tutorial/ that was too good
Hi there, Stop wasting your time I've written a definitive article about how to build a Multi User WordPress blog network for both in existing WP installations and for new MU installations. Here is the link: http://softstribe.com/wordpress/setup-mu-wordpress-blog-from-scratch-in-existing-wp-blog-too Regards, Muhammad Haroon