Expenses

Is it possible to add a feature where you can input what your expense was cost, and then have to so you can mark it up to sell out.
E.g I buy a car part, like a Air filter for ￡11.50 cost, but i want to mark it up by 20-25% to sell. Then i could keep track of what i spent on parts(expenses) to buy in and then keep track at what i sell out for, then i know what i am making on parts sold and labour sold.