Adding custom product to invoice, and appropriate tax settings for it

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Could Shopify make it so that when we add a custom product that we can specify the tax settings for it?  I'm a retailer in Ontario, and when I add a custom product to a customer's invoice, I can't make it GST-only.  (Eg books and children's clothing in Canada is gst only).  My workaround is to have a custom product with cost $100, that is gst only, and then to make a discount on it, but not very nice for the customer's invoice or order history....