Automatically Calculate Stock Profits In Logbook

[SamuraiSam83]

Hi,

I have a logbook that I am using to keep track of investments. I have found a formula that calculates the Profit/Loss, but it requires me to manually select the Cost value in the Profit/Loss formula for it to work. I would like to know if there is a way to automate this so that it automatically selects the Cost value. I don't know how well I can explain what I am trying to do, but I have uploaded a sample of my workbook.

Regards,
Sam