How to Hide BMLT Workflow Admin Menus

function plt_hide_bmlt_workflow_menus() {
	//Hide "BMLT Workflow".
	remove_menu_page('bmltwf-settings');
	//Hide "BMLT Workflow → Configuration".
	remove_submenu_page('bmltwf-settings', 'bmltwf-settings');
	//Hide "BMLT Workflow → Workflow Submissions".
	remove_submenu_page('bmltwf-settings', 'bmltwf-submissions');
	//Hide "BMLT Workflow → Service Bodies".
	remove_submenu_page('bmltwf-settings', 'bmltwf-service-bodies');
}

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

Where do I put this code?