I read the following. However, how do you do this in the template? Will it accept only putting in the amounts for the one product and the offset? Else you would still have to get the quantities for all products and this is very tedious?

Is there a shortcut to the VOC budget method if you have just one product that is used minimally on a project?

Yes, if you have just one non-compliant product, then you can balance it out with just one really good, low VOC product, as long as all your other products meet the requirement. For example, if you have two gallons of non-compliant adhesive that is 100 g/L over its required threshold, then you can balance it out with enough compliant product where you show you are at least 100g/l under the required threshold, thus balancing the VOC budget.