How to Hide WP human resource management Admin Menus

function plt_hide_hrm_menus() {
	//Hide "HRM".
	remove_menu_page('hr_management');
	//Hide "HRM → Dashboard".
	remove_submenu_page('hr_management', 'admin.php?page=hr_management#/dashboard');
	//Hide "HRM → Organization".
	remove_submenu_page('hr_management', 'admin.php?page=hr_management#/organization');
	//Hide "HRM → Departments".
	remove_submenu_page('hr_management', 'admin.php?page=hr_management#/departments');
	//Hide "HRM → Designation".
	remove_submenu_page('hr_management', 'admin.php?page=hr_management#/designation');
	//Hide "HRM → Employee".
	remove_submenu_page('hr_management', 'admin.php?page=hr_management#/employee');
	//Hide "HRM → Profile".
	remove_submenu_page('hr_management', 'admin.php?page=hr_management#/employees');
	//Hide "HRM → Payroll".
	remove_submenu_page('hr_management', 'admin.php?page=hr_management#/payroll');
	//Hide "HRM → Attendance".
	remove_submenu_page('hr_management', 'admin.php?page=hr_management#/attendance');
	//Hide "HRM → Leave".
	remove_submenu_page('hr_management', 'admin.php?page=hr_management#/leave');
	//Hide "HRM → Recruitment".
	remove_submenu_page('hr_management', 'admin.php?page=hr_management#/recruitment');
	//Hide "HRM → Settings".
	remove_submenu_page('hr_management', 'admin.php?page=hr_management#/settings');
	//Hide "HRM → Add-Ons".
	remove_submenu_page('hr_management', 'admin.php?page=hr_management#/addons');
}

add_action('admin_menu', 'plt_hide_hrm_menus', 11);

Where do I put this code?