Ordering product items in e-commerce

Hi everyone!!

Does anyone know how can I sort product items in ecommerce??

I can’t simply drag and drop them as they were pages. I just need to keep a specific product item from where it is now to the top of my product grid as first visible product.

My client would like in future to be able to add new products by himself so I would like to understand how could he organize the products order as he wants.

Please help, thanks!!!