Share Users in Multisite, or export / import

Is this possible? If so, how?

On my main page in my multisite network, I have well over 3000 registered users, mainly commercial.
So I decided do add another sub site only for commercial customers.

On my new sub site there are no users though.
I tried exporting with the many plugins out there, but not one saves all the data.
As per here -> https://docs.ultimatemember.com/article/1549-export-import

I also tried cloning the database/table, but it’s somehow empty.

Is there anything else I can do to have the exact same users + data on my sub site?