Greetings comrades, I just added 2 new fields in sales prices which are tall and wide. What I want to do is to know how I can get to add to my coticacion a product, I select the unit of measurement is in meters and I reckon the charge for square meter. Not if there is already some module to do this but if you could guide me please. I have been breaking my head to not find the file where are these calculations. These are the data of the installation of my system:

OpenERP Version 7.0-20140409-231230

I have it installed on ubuntu 12.04