Site B2B
User can buy and sell to each other
Process: sell-buy-auction like ebay-rent
Category and products
Product can have standard definition like ebay or other web site
Product depending as category can have different definition as table
Related product
For each product we can define different related products
1-old 2-new 3-simmilar 4-child 5-cross reference
Product and related we can upload at excel or csv or anything u suggested
When upload at csv or .. also if give link for pictures uploaded