I’d like to migrate some quite huge WordPress-Blogs into one Multisite Installation.
The Export-Wizard and the Import Wizard are bound to PHP-Limits (Memory, Execution-Time) and so the Export and Import often fails.
There must be a way to do it by hand (only using MySQL and or the command line).
2 Answers
http://sillybean.net/wordpress/migrating-single-wordpress-installations-into-multisite-networks/