The Top Products page can be located inside the Walmarts Profits page here Top Products 
The Top Products page will provide a monthly overview for your products.
You can sort by Units Sold, Total Orders, Gross Revenue, Refunds, Walmart Fees.
The Products will display the following data:
PRODUCT
UNITS
ORDERS
REVENUE
SHIPPING
REFUNDS
FEES
COGS
TOTAL COST
NET PROFIT
MARGINS