Can I have multiple rates per item?

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• I use 'per product' shipping to set the prices on my products, but can I have one of the variants of one of my products have a different price to the rest of the variants?
• I only want to use Better Shipping with one of my products, and want to leave the rest with the shipping rules that I have. Is that possible?
• Can I set multiple rates for a single product depending on quantity?
• Can I use shipping calculators in conjunction with your app?
• Do I need to upgrade my Shopify plan for the carrier calculated shipping feature to use Better Shipping?