Sure I can!
I started with
wget -qO weby qrok.es/wy && sudo bash weby 3
sudo webinoly -conf-value_max-mb-uploads=200
sudo webinoly -conf-value_nginx-ppa=mainline
sudo webinoly -timezone=America/Sao_Paulo
sudo site mainsite.com -wp -env=development
sudo site mainsite.com -ssl=on
sudo site mainsite.com -multisite-convert
Then I edited wp-config, went to the dashboard, created the network as a subdomain, and created a website.
Went to cloudflare, pointed the new domain as a A domain to the same IP as the main site.
sudo site newdomain.com -parked=mainsite.com
sudo site newdomain.com -ssl=on -root=mainsite.com
at this point, when I tried accessing the main website it redirected to the newly created parked domain.
i then had to go to my database and edit the wp_options to fix the addresses.
actual live examples: