Add "Sort by discount" option to Sort Dropdown menu

Here's how to add a "Sort by discount" option to the sorting drop down menu.

1

Create a custom plugin

If you haven't done so already, create a custom plugin.

2

Add the following code to your custom plugin:

3

Save

Save your changes.

More information about customizing the sorting menu can be found here: http://docs.woothemes.com/document/custom-sorting-options-ascdesc/