
I also sometimes shop at Walmart.com or use Walmart Grocery, but I personally don't have any Rules set up for these particular instances; I just edit those specific transactions as they download to correct the Payee name.
If you'd like to get rid of the "Shopping" Category, you can also create a Category Rule for Walmart using the Category of your preference (mine is "Groceries" since this is the bulk of my Walmart shopping). Our Support Article here has more details on using Transaction Rules in Simplifi.
Please let us know how it goes!

-Coach Natalie