Watch a video tutorial for how the base works here: https://youtu.be/8CFbkgekndY
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*Important*
When you copy this base, Airtable will generate new form links for the "Received" and "Sold" tables so that they're unique to your base. That means you need to copy the form links from those tables and paste them into the formulas in the two button fields in the "Products" table where it says "Paste form URL here". If you want more guidance, watch the button part of the YouTube tutorial :)