Web gurus help: Domain Name question?

Hi, am hoping someone can help ,e out - I know there are some web guru’s here.

If say I have the domain name harry.com do I aautomatically have the rights to something like admin.harry.com

if so can you point me to somewhere that shows me how to set this up.

Thanks

google “how to set up subdomains” for your particular domain service
.

yes you can setup those sub domains - how depends who is your host server provider
.