Help setting up a specific domain mapping set-up


I have a multisite configured as a subdirectory install with domain-mapping and multi-domains both installed and activated. No issues with this.

I have a number of sub-sites mapped: <— <—

That’s all fine and dandy.

How do I set-up the following? —-> hosted under one directory —->

So the above would become: <— <— <—

Help appreciated on this one please.