Sell in cartons or packs (bulk unit of measure)
Let staff sell a whole carton or single pieces from the same product.
Open the item
Edit the product and find the Bulk Unit of Measure section.
Name the bulk unit
Enter a Bulk Unit Name like Carton or Box, and how many base units it holds — for example Units per Bulk = 10.
Save
Now at the till, staff can choose to sell a single piece or a whole carton, and the stock count drops by the right number of pieces automatically.