Sales Invoice - Line

Sales Invoice custom field

i need to add field can be use any of this signs ( + , - , * , / ) with amount

how i do it

it is not clear what you are trying to accomplish.
can you please explain with a screenshot?

I want to add a new column in which the number can be added to the amount and then the tax is calculated

you can perform arithmentic functions in the input fields itself.

image

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but i need to see customer each category price on same line

create two line item custom fields to input the price and the number by which you need to multiply.
then enter the calculation as shown in the screenshot in my previous post.

Iā€™m sorry you are to help me but i cant do like this i need to add in theme

i found this one
Include calculations in custom themes | Manager
i need to do this calculation with ( new colum i will insert X + amount colum )

this cannot be done with custom themes. you cannot change transaction amounts by using custom themes.

ok thank you