It is normal in business to deal with the multiple units of measure, purchase in different units, preservation in a different unit in warehouse, and sale in a different unit of measure. Odoo has a feature to manage multiple units of measure for sales, purchase, and inventory efficiently.
There are many business cases where the purchase is done in bulk to get the price benefits and the same product sale in different unit of measure, that is, purchase in pack of 1000 and sale in the pack of 6 or pack of 12, but the stored quantities in warehouse can be identified as a unit only.
Let's see how to activate the multiple units of measure feature in Odoo, purchase in big packs, stored it as a unit, and sell in small packs.