Enter webmin in a Windows domain with DNS

SYSTEM INFORMATION
**OS type and version: Ubuntu 20.04
**Webmin version: 1.981
**Virtualmin version: 6.17.3
**Related products version: Versione Usermin 1.823

Please help me. I have my domain for active directory. this my domain have dns.
domain is mydom.local on each pc have this domain and this DNS.
now i want to have a domain “myweb” different from mydom.local, but i want know this dns information on my dns mydom.local what i can for this solution? or other solution same this