This assumes that you have a new wordpress installed with multisite enabled and that you want to move an existing site into it. It also assumes that you have WordPress MU Domain Mapping plugin installed Database export current database as sql and edit sql file replace `wp_ with `wp_ nnn _ where nnn is the blog id in wp_options change field name wp_user_roles to wp_nnn_user_roles Note that wp_user will be ignored Rename links wp-content/uploads/xxx to files/xxx wp-content/gallery to wp-content/blogs.dir/nnn/gallery import the file in the new database Files Transfer content of uploads to blogs.dir/nnn/files (Nextgen) Transfer content of gallery to blogs.dir/gallery Settings update (Nextgen) option: update default folder (wp-content/gallery) to wp-content/blogs.dir/ nnn /gallery/ (to do this in wp_nnn_options, field ngg_options Post update After importing the new database, you might to change some links after changing the domain name: UPDATE wp_nnn_posts SET POST_CONTENT...