Excel normally You type in a normal profit and loss account, prior year might work, forecast is better. Then you see how your freight cost changes from sea to

Excel normally You type in a normal profit and loss account, prior year might work, forecast is better. Then you see how your freight cost changes from sea to air by getting a quote from your freight company of choice. If it is 5% more then change the freight line in your p&l to be 5% higher. Are you still profitable?