Tier pricing is a promotional tool that allows a store owner to price items differently for higher quantities.
The Related Products option provides the opportunity to advertise products that are not part of the selected category, to your visitors. These products are displayed on the product details pages.
The Cross-sell products option provides the opportunity to buy additional products that generally go with the selected product. They are displayed at the bottom of the checkout page.
Note:For best zoom view, upload an image with minimum 1000 pixel (width) x 1000 pixel (height) dimensions
Here you can see a history of the product stock quantity changes.