Step 1: Choose the products you want
Step 2: It was added one by one for same product in POS
Step 3: Click the three lines in the top left corner and click Settings
Step 4: In Settings select Product/Menu Settings choose Increase item quantity if it already exists.
Step 5: A popup will appear for change and restart.
Step 6: After Restart add same with more quantity you can see the difference in POS.