Hi,

1- You can add the Unit of Measure on the product page.

2- For managing product UOM as boxes and pieces, try the following steps.

1- Enable 'Units of Measure' in the configuration settings.

2- Create Unit of Measure Categories.

Inventory > Configuration > Unit of Measure Categories

3- Assign the UOM to a product.

4- Purchase the product with uom as boxes.

5- Receipt.

Hope it helps

1. the unit of measure is set in the product information on the first screen.
2. The purchase unit of measure, that needs to belong to the same unit category is also available on the same screen
3. To have boxes with a certain number of pieces, you have to define it in the unit of measure
4. To go further, you can activate packaging in the settings and then in the inventory view, you may define specific packages for the product each specifying the quantity. It will be recognize, but only if a multiple of a package is used.

Good Luck

Eva P.