The Discount module offers a single hotkey that is quite important. All you have to do is select a discount and then click the two buttons below to edit it. If you haven’t selected a discount from the list of ones that are currently available, you will be prompted to do so by a message that pops up. Of course, you can also click CTRL + N to create a new discount, but that is the same across the vast majority of Fishbowl’s modules.
Here is the Discount module’s hotkey:
CTRL + E = Edit the selected discount
Check out this hotkey and many others in Fishbowl’s Documentation Wiki.