The following snippet will add fields to the WordPress user profile in your profile section. In this code, we provide two fields, Sales Partner and Address. You can add any number of fields. These fields are saved in a user profile. So need to create an extra table to store this data in WordPress.

function add_custom_user_profile_fields( $user ){ echo '
'._e('Profile Information', 'your_textdomain').'
'; echo ''; echo '

    

      '._e('Sales partner', 'your_textdomain'); ?> 
    
    

      

      
        
    
  
  

   

     
      
   
  

    

      
        
    
  

}function save_custom_user_profile_fields($user_id ) { 
if (!current_user_can( 'edit_user',$user_id))return FALSE; update_usermeta( $user_id,'sales', $_POST['address']); 
update_usermeta( $user_id, 'land', $_POST['land'] ); 
}
add_action( 'show_user_profile', 'add_custom_user_profile_fields'); 
add_action( 'edit_user_profile', 'add_custom_user_profile_fields');
add_action( 'personal_options_update', 'save_custom_user_profile_fields' ); 
add_action('edit_user_profile_update', 'save_custom_user_profile_fields');