The second option is using modifiers.
You can create "Discounts" modifier group and add items such as "0.50 off", "0.75 off", "1.00 off", etc...
You'll enter modifier prices as negative numbers
You'll activate single selection and enable "Add modifier price to product price"
Combining them with "default properties" feature you can add discounted item buttons in your menu.
Let me describe you this little trick.
For example you have a discount modifier named
0.50 off for Coffee.
- Enter Menu List, open your menu, double click to the category where Coffee is in..
- You can't add coffee again because it already inserted in menu. Right Click on "Product List" and choose Display All Values. Now you'll see Coffee at the end of the Product List. Add it to the "Selected Products" list and click "OK". Now you'll have two Coffee buttons in your menu.
- Click "Edit Product Properties" and change the header of the second button something like "Discounted Coffe"
- Enter 0.50 off to the default properties column. You can merge multiple properties with comma here. For this reason your modifier names can't contain comma...
Now when you click "Discounted Coffee" button 0.50 off modifier automatically applies...
Normally we use this feature for creating menus with modifiers. For example we create modifiers for Hamburger Menu drinks and deserts. When user clicks Hamburger Menu default modifiers (for example coke + apple pie) applies. If needed operator changes them... For this example we enter
Coke,Apple Pie to Default Properties column
On your end of day report you'll see total discount amount at "modifers" section.