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I am having a problem setting up the attributes. I sell chemicals and each chemical comes in 2 - 4 sizes (16 oz, 32 oz, 1 gallon, and 5 gallon) I can’t figure out how to set up any particular product with a drop down menu of sizes. Each size has a different sku and price. I need to set it up so when my customers pick their desired size, the shopping cart will automatically populate the correct sku and price for that size product.