Hi SheepDB ,
I don't know if that is what you're looking for, but you can use ATUM Export Pro to export stocks and prices to a CSV and then make your calculations and present them to your auditor using any spreadsheet software.
If you want to see it in Stock Central, we can add this thread as a Suggestion, and if enough people ask for it, we'll consider including the column in future versions. What do you think?
Best Regards,
José Andrés