[Imported] Margin/Markup fro certain products or suppliers?

Is there a way to add a field that is for the percentage margin/markup percentage? I see that there is a cost price and a price field, is it possible to add a margin field that does the calculation?

Can this be done for certain products/categories or suppliers?

Here is a sample calculation we use:
Price Quantity
1.59 0.318 1.908 0.7632 2.6712 0.53424 3.20544 3.5 1
0.99 0.198 1.188 0.594 1.782 0.3564 2.1384 2.5 6
0.99 0.198 1.188 0.4752 1.6632 0.33264 1.99584 2 144

I can send it to you if you need. But generally we have a cost, then add a margin calculation, add VAT and round.

Any help is appreciated.