If you are an existing Walmart seller and want to manage your Channel inventory based on Magento data, you may use the 3rd Party Listing functionality.
This article will guide you step-by-step on how to transfer your 3rd Party Items into M2E Pro Listing.
Step 1: Enable the 3rd Party import
Step 2: Open the 3rd Party Listing
Step 3: Map the 3rd Party Item to Magento Product
Step 4: Move the 3rd Party Item to M2E Pro Listing
Step 5: Assign Walmart category
M2E Pro will automatically schedule synchronization of 3rd Party Item with Magento data right after the item is placed into M2E Pro Listing.