Add a new number column for line total


I have created a custom invoice and I was wondering is there is a way to add a number column to products and quotes.
For example, I would like to be able to create a quote that calculates the line total per days.

Product. Price. Quantity. Days. Total
Name. 200. 4. 2. 1600.



Sorry, it isn’t supported. You can add a custom product field but it won’t be included in the calculation.