How would you Calculate the Value Added at each stage in making a wool suit?

Start Calculating from a sheep Farm to the Making of Suit.How would you Calculate the Value Added at each stage in making a wool suit?
you didn't provide specifics, but the formula is the same for each step of the process: variable income minus variable costs. Thus, if the next ';step'; in the process has added variable costs of $10 and adds $12 to the sales price, the the value added at that stage is $2.