Discount amount on invoice

Discount amount on invoice

 Hi,

For example, I have a client who orders 1000$. I give him a 10% discount, so his price is 900$.

But, rather than showing the discount percentage (10), I would prefer to show the figure (100$) in the discount column. Is this doable? Real numbers look better than percentages, and I want my client to know exactly how much of a discount he is getting off the real price.

Or how can I display AmountBeforeDiscount?

Thanks