When you register a name you are registering a .eth 2LD (second-level domains, like
ens.eth) which is on the TLD (Top-level domain)
These ENS names can create subnames - examples:
name.eth may create
1: Create Subname
Go to the Subnames-tab of your name and click the "+ New subname" button.
2. Type in the Subname to be created
There are no registration fees or limit to the number of Subnames that can be created. It will only cost gas to do.
3. Open wallet and confirm onchain.
4. 🎉Your Subname is created🎉
The Subname is now created.
5: View the Subname's profile & add records like ETH Address
You may now choose to add other records to your name, including the ETH address which is not added during creation. Read more about the The ETH Address record.