Emercury has a feature that allows an adminstrator or account owner to add one or more users to manage and assign specific roles in the system. You can set it up by giving their own access without requiring them to log into the master account. In the dashboard click 'Preferences' and select 'Add Users'. 
Click the 'Add' button to continue.
Set up the account for your user(s) and select the corresponding roles you want to assign and hit 'SAVE'.
If you select 'ADMIN' you cannot select the rest of the roles because admin has all these privileges.
If you select 'BILLING MANAGER' you can select all roles except Admin and Reporting manager.
Check Functionality in each roles
Once you set it up successfully you will see this screen. If you wish to add more users just hit the 'ADD' button otherwise you can delete users.
The user that has been added in the master account has his own credentials to login. Click the 'Login Page' to access the account.
