Hi all- got my hands on office and excel the other day and so am...

Hi all- got my hands on office and excel the other day and so am wondering if anyone knows of a formula to use in there to get my csv files to give me a profit/loss value?
Someone mentioned pivot tables when I was asking about this initially, prior to my buying office.
When I remember that everything my accountant does still leaves me liable for any errors the accountants make it leads me with a wish to have a basic idea of where I’m at each year myself.
Cheers in advance for any help- the spike and wobble on Friday tell me the spring is being compressed again, we know we can hit $1.20 now so if that gets breached and we continue to consolidate around $2 things are really looking good, ( good as in we may reach fair value in the not too distant future by peer comparison etc ).