Can we add unit to the invoice ?

Hello, f-ransiskalu-gma. 

Thank you for reaching out to the Community.  I agree with Fiat Lux - ASIA. Also in QuickBooks, you can include your product's SKU, quantity, class, amount, tax, and description.

As a workaround, you can indicate the unit in the Description field on the invoice page.   

 To know everything about these processes, you can check out this article: Add product and service items to QuickBooks Online. 

Let me know if you have additional questions. Stay safe and have a great day ahead!