Moving path-based Multisite to a different subdomain.

Hello ??

I am currently developing a path-based Multisite network at ‘dev.website.com’ and all is going well! When I am done developing, I would like to transfer the ‘dev’ site over to the primary ‘www’ subdomain. There are 3 sites and the structure is currently like this:

dev.website.com
dev.website.com/site2/
dev.website.com/site3/

I would eventually like this structure:

www.website.com
www.website.com/site2/
www.website.com/site3/

Basically, ‘dev’ subdomain to primary ‘www’ subdomain.

What is the easiest/best way to achieve this?

Please accept my apologies if this has been answered before but searches tend to return results for moving a subdomain-based Multisite, not a path-based Multisite from one subdomain to to another.

Best regards,

Paul.