Here's a talk from WordCamp 2014 about (at least part of) this: https://wordpress.tv/2014/11/01/kathleen-vignos-migrating-17-wp-blogs-on-wired-com-into-one-wor

Here's a talk from WordCamp 2014 about (at least part of) this: https://wordpress.tv/2014/11/01/kathleen-vignos-migrating-17-wp-blogs-on-wired-com-into-one-wordpress-install/ https://wordpress.tv/2014/11/01/kathleen-vignos-migrating-17...