I would like to create a discount formula in the repair-quote module
someone can help me?

the discount formula that I want in my repair estimate, must behave like a % discount with the unit price excluding tax,
the repair module in the estimate there is no discount I plan to do it with studio but after the estimate at the level of the invoice there is the estimate
on one line the discount must be made on the unit price excluding tax and make up the difference in the total excluding tax.
discount= unit price *discount rate .
I have odoo online v15