Follow the below steps for changing a DNS for each site,
Open IIS, to click a Bindings
for Bold BI Enterprise site and click an Add
button for adding a new DNS.
You can add multiple binding to the Bold BI site in IIS.
Fill the Host name
as your wish and click OK
.
Now open a Bold BI site settings page and update a site URL
for which site you want to change the DNS.
Now you will be able to access each site with the specific unique URL.
NOTE: You can change only the host name to site URL.
Click Save
, now your site will be running with updated site URL.