Have Shopify set up to calculate tax and add to invoice as separate item. Also generates reports so we can account for and send tax payments to various government entities. These functions need to be retained. Also want to be able to sell other items for which we must collect federal excise tax (FET). These would account for, say, 50% of our inventory, with the other 50% being non-FET items. Can we get Shopify to add FET to the correct items and have the tax amount added to the selling price? In other words, the FET would not be visible to the customer, but would be recorded behind the scenes in Shopify as a separate item so we know how much to report (and pay) to the federal government. Any ideas greatly appreciated!