How to verify a travel agency itinerary cost list to ensure no items are missed?

When preparing travel agency itinerary costs, the biggest fear isn't the guest complaining about the price, but realizing you missed an item after quoting a low price. Flight taxes, baggage, seat selection, hotel resort fees, airport transfers, attraction reservation fees, and credit card processing fees—if you miss one, you'll have to explain it yourself later. I don't rush to give a total…