I've done a little research on UPC codes for my husband's business. I HATE manually counting stuff for his year-end inventory. Yes you would have an individual code for each item. Though I'm not especially fond of this lady, she did a good video when she opened her retail store. I'm not as copy/paste savvy as others here, but you can find a You Tube video at Essential Soap "How to Buy Barcodes and Create Barcode Labels for your Homemade Soap Tutorial" with Essential Soap. Though it's drawn-out, I found it helpful as a primer to UPC codes. How exciting that you are considering going "Big-time" with Amazon!