Here is how you can add note on item:
Step 1: Click on 'Menu' on upper left corner
Step 2: Click on 'Inventory Management'
Step 3: Choose the item to which you want to add a note
Step 4: Click below Sublist or Variant price and details
Step 5: Scroll down and click on 'Internal Note'
Step 6: Add a note and click on Update
Step 7: Click on Save on upper right corner
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