Situation = Existing large-ish standalone WP site with an out-of-control post categories / sub-categories list. It's an ideal candidate for moving to a WPMU site with the existing top level categories each becoming a child blog, and then the sub-categories each nudging up one level to become the top level categories in their respective child-blogs.
Question - how can it be done without loads of copy-paste from the main blog to the child blogs, re-uploading images etc.
Has anyone tried it or done it yet?
Thanks in advance
Gaz