Here is how you can add discount on receipt in counter:
Step 1: Click on counter at the bottom of the screen
Step 2: Click on 'New Sale (+)'
Step 3: Choose the category from which you want to add an item to the counter
Step 4: Click on item which you want to add to the counter
Step 5: Choose the number of units you want add to the counter ( (+) for addition of an item and (-) to remove)
Step 6: Click on 'Go to the Counter'
Step 7: Click on Add Discount (under grand total)
Step 8: Add discount and click on save
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