Steps for adding new products
Navigation: Go to the Products tab in the left navigation menu. Click on the +Add Product button.
Enter Products: Select the campaigns and line items to which you want to add products. Enter all your SKUs on the right side, separated by line breaks. Then click on the Next button.
Enter the Product Bid Override: Enter override bids to control the bids at a product level, irrespective of the line item bids for all the products. Use Custom Bids to apply a custom bid directly to all the products.
All set: Click Submit, and your products will be added.