Create a WHM user without an associated domain :-
Step 1 :- Log in as the root user on the server via SSH.
Step 2 :- To create a new user, run the following command:
adduser username
Step 3 :- To set a password for the new user, run the following command:
passwd username
Step 4 :- To create an entry in the resellers file that grants the user full permissions, run the following command:
echo "username:all" >> /var/cpanel/resellers
Step 5 :- Log in to WHM as the root user.
Step 6 :- In WHM go to Edit Reseller Nameservers and Privileges interface . Home >> Resellers >> Edit Reseller Nameservers and Privileges .
Step 7 :- Select username from the menu.
Step 8 :- Click Submit.
Step 9 :- Select the checkboxes that correspond to the desired user permissions.
Step 10 :- Click Save.