Adding costs to a sales report to enable profit & loss reporting

Adding costs to a sales report to enable profit & loss reporting

Hey,

I currently have a good dashboard to report our internally monthly/quarterly sales.

The request I have had is to show for each product (condensed into categories) what the actual profit is that month/on that product etc.

Is it simply overlaying the costs - how do I get Zoho to do the math/formula that would make this work?

TIA for any help,

Heather