Trying to clean up post on this so starting a new thread.  Previous thread here: http://our.umbraco.org/projects/website-utilities/tea-commerce/tea-commerce-support/34699-Shipping-Method-per-Product

Using the OrderLineAdded event I have created my custom shipping calculations based on the product property.

This is working for adding one orderline.  It populates the amount properly for a quantity of that same orderline (if I order 2 of the same exact product it calculates correctly).  But if I add an entire new product to the order, it clears out the shipping and only totals for the last item added. Thoughts?

Here's the main lines of the method I have hooked into OrderLineAdded:

If (order.ShippingMethodId != intShipDefault)
{
order.ShippingMethodId = inShipDefault;
}
foreach (var property in orderLine.Properties)
{
if (property.Value.ToString().ToUpper() == "HALF")
{
shipFeeHalf = orderLine.Quantity * intShipHalfCost;
}
if (property.Value.ToString().ToUpper() == "FULL")
{
shipFeeFull = orderLine.Quantity * intShipFullCost;
}
}
order.ShippingFeeWithoutVAT += shipFeeFull + shipFeeHalf;