To set up a maximum order quantity for a product:
  1. In the administration panel, go to Products > Products.
  2. Click on the name of the desired product.
  3. Enter the desired number in the Maximum order quantity input field.


  4. Click the Save button.
    NOTE: After that a customer will not be  able to buy the quantity of this product items which will be more than  the number set up for the Maximum order quantity option.