Unit type problem

How i can add “USE” the unit type as feild in invoice table for non-item…

It should showing the qty - qty unit - qty price - tax - total

You cannot. Both inventory and non-inventory items have units. But if your line item is neither of these, there is no definition of it anywhere in Manager. Therefore, you must include the unit of measure in the Description field for the line item.

For example, if you charge customers for shipping based on distance, you can create a non-inventory item, Shipping distance, and give it a unit of km. If you do not want to create the non-inventory item, you would instead describe the line item as Shipping distance (km) and just enter the number in the Qty field.