Here is how you can add modifiers with price:
Step 1: Click on 'Menu' on upper left corner
Step 2: Click on 'Inventory Management'
Step 3: Click on 'Modifiers'
Step 4: Click on (+) at the bottom of the screen
Step 5: Click on the 'Add Modifier'
Step 6: Enter the Modifier Set name, modifiers and their price
Step 7: Click on 'Save' on upper right corner of the screen
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