How to apply a discount to invoice

[Mreilander]

Hello, I'm new to the forum, and new to the software. I'm having a problem applying a discount to an invoice. I went to the invoice options and checked the box that says 'show discount column'. It shows on the printed invoice, but when I'm creating an invoice, there is no field for me to enter a discount value. The only place I have found a field for discounts is in the 'New Cash Transaction'. Am I missing something? (I must be )

 

Thanks in advance