Form submit change values

I am trying to make a money saving kind of thing in netlify and i want to submit a form, half it and update some values, here is my code so far

<form name="money" method="POST" netlify>
        <p>
            <label>How much to add: £<input type="number" name="money-in"></label>
        </p>
        <p>
            <label>How much to remove: £<input type="number" name="money-out"></label>
        </p>
        <button type="submit">Submit</button>
    </form>

Hi, @Alex_Dempster, I’m not sure how to reply as there isn’t a question here. Would you like assistance with something? If so, what type of assistance would be helpful here?