Hey Mike,

You can have 2 properties, but not the two you are wanting. Like I say, rather than Price and Discounted Price, you'd instead have Price which holds the current price you want to charge (so if you don't have a discount, it is the un-discounted price, but if you do have a discount, it's the discounted price) and something like Discounted From Price which can hold some value for what the price of the product was before discount.

In your front end code then you can check to see if Discounted From Price has a value and if it does, you know it's discounted so you can do similar view logic.

A common output would be to show the pre-discount price with a strikethrough which would have code something like:

var price = CurrentPage.GetPropertyValue("price");
var discountedFromPrice = CurrentPage.GetPropertyValue("discountedFromPrice");

<div class="price">
    @if (CurrentPage.HasValue("discountedFromPrice"))
    {
        <span class="strikethrough">@String.Format("{0:n}", discountedFromPrice) DKK</span>
    }
    <span>@String.Format("{0:n}", price) DKK</span>
</div>

By doing it this way, the price that TC will charge is always in the price field regardless so TC will know what to charge.