You can make changes to your Walmart pickup order without cancelling it. It's possible if your order is still being prepared. Here's a simple step:
Log in to your Walmart account.
Find the "Purchase History" button, which shows your orders and their status (like shipped,
cancelled, or in the process).
You can edit your order if your items are still being prepared for pickup or delivery.
Click on the "Edit" button next to the order.
You can change your order as needed without having to cancel it.