Can I register a product at expenses but in my inventory that will be display in differents products? Exam. If i buy 1 pound of rice and I sell rice on packs of .2 pounds

Thank you for contacting us, nayaralopezaquin.

QuickBooks Online (QBO) doesn't have an option to add a unit of measure (U/M) for inventory items. This U/M feature is only available in QuickBooks Desktop.

In QBO, you can enter the one pound of rice as inventory. Then, use the Bundle type to sell packages. This should let you sell the pack with 2 pounds on it. 

I've listed the four types of items you can select in the system:

• Inventory: Products you sell and track quantities for.
• Non-inventory: Products or items you buy or sell, but don't need to track quantities. 
• Services: Services you provide to customers.
• Bundle: Several products or services you sell together as a single item. 

To add a product:

1. Go to Sales from the left navigation bar, then Products and Services.
2. Select New, then choose the type you want.
3. Add a name, SKU, or category for what you're tracking.
4. Add your product’s Initial quantity on hand.
5. Enter when you started tracking that quantity in the As of date field.
6. Complete other fields to track the item.
7. Click Save and close.
   

I've added these handy articles to learn more about entering what you buy and sell in QuickBooks:

• Add inventory products
• Group your products and services into different categories.

Let me know if you need additional information. Just tag my name, and I'll get back to you.

@nayaralopezaquin 

When you buy inventory, that is an asset purchase, not an expense.  The cost becomes an expense only when you sell the inventory.

Stock the item in the lowest qty that you sell it in, in your example a qty of one would equal 0.2.  So if there were 16 ounces to a pound, and you order one pound, you would stock 8 as the qty.