How to create a Multi-Network subsite?

I’ve enabled WordPress Multisite (subdomains) on, and installed/enabled WP Multi-Network.

I’ve created a new network @

How do I create a subsite in that network, e.g. redirects to

If I create a new site @, I can’t make it a subdomain or subdirectory of

Help appreciated.

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With the multisite install main site and network on
you can have the subiste as

you will need to have your multisite as a sub-folder installation and not a sub-domain installation (ref the codex)

As you are using WP-Multi-Network you should be ok to go to create a new site @ Otherwise if the site has already been created on the Multisite installation go to edit the network for and select from the available sites the one(s) that you want to add to the network.