The following simple example would use this mysterious SUBTOTALPRODUCT function to come up with the number for Planning expenses, per person expenses, and total cost.
Does this make sense?
Cost Amount #
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Planning Expenses 3,700 1
Air Fare 1,000 1
Additional Transportation 500 1
Accommodations 700 3
Phone Bills 100 1
Contingency/Misc. 3,125 1
Ground Transportation 10,000 1
Per Person Expenses 1990 1
Round Trip Airfare 1,000 1
Visa/Entance Fees 140 1
Meals & Accommodations 350 1
Excursions 250 2
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Total Cost 18,815