To add new users to an on-premise custom Odoo instance , follow these steps:

1. Log in as Administrator

• Open your Odoo instance ( http://yourdomain.com:8069 or localhost).
• Log in with an admin account.

2. Navigate to User Management

• Go to Settings > Users & Companies > Users .

3. Create a New User

• Click Create .
• Fill in the details:
  • Name : Enter the full name of the user.
  • Email : This is the login username.
  • Language : Select the user's preferred language.
  • Company : If using multi-company, assign a company.
  • Allowed Companies : Define which companies the user can access.

4. Assign User Access Rights

• Scroll down to the Access Rights section.
• Choose the appropriate User Type :
  • Internal User (for employees)
  • Portal User (for external customers)
  • Public User (for website visitors)
• Assign necessary modules and roles (eg, Sales, Accounting, Inventory).

5. Send an Invitation (Optional)

• If the user has an email, click Send an Invitation so they can set their password.
• If manually setting a password, skip this step.

6. Manually Set Password (If Needed)

If no email is used or you want to manually set a password:

• Go to Settings > Users .
• Select the user, click Action > Change Password .
• Set a temporary password and share it securely.

7. Test User Login

• Ask the user to log in and verify their access.

For Command-Line (CLI) / Odoo Shell

If you want to create a user via the command line (Odoo shell):

1. Open terminal and enter:

sh
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odoo shell -c /etc/odoo/odoo.conf

1. Run the following Python command:

python
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env[ 'res.users' ].create({
     'name' : 'New User' ,
     'login' : 'newuser@example.com' ,
     ' email' : 'newuser@example.com' ,
     'password' : 'securepassword' ,
     'groups_id' : [( 6 , 0 , [env.ref( 'base.group_user' ). id ])]   # Assigning "Internal User" role
})

This will create a new user with an internal role.