Hi good afternoon, I think not explain me. What I want to do is add a couple of fields for height and width and the elejur in measurement units enable me to enter these fields measurements, calculate the square footage and based on my product cost me the result. it's what I'm trying to do, and I could add the fields I just need to know how to add it to the load, exactly where in I can change it because I've been trying it but do not make it. According to me it must be the modification of code in the module sales. Or failing if not already found some module that aggregates these fields and calculation.