Can you Migrate Existing Multisites to Networks?

I’m the webmaster for a school district. I have implemented WordPress multisite in the hopes that it will help us manage user access.

I already have about 70 sites for schools and departments. I’m trying to figure out if this plugin will allow me to convert the current multisite network into new networks.

For example, I have multiple high schools with their own WordPress Multisite site. Each high school wants several departments so url structure should be /high-school/department. Ideally members of department would only have access to department pages (/high-school/department/pages(*)).

It looks like this plugin will do that. However, I can’t see a way to convert the existing (/high-school) install to its own network. I’ve been playing around with it on my dev environment, but I don’t want to break everything cuz it’s a pain to do a full restore.

Any advice?