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Walmart Fulfillment Services (WFS)
After you’ve created a Shipping Template, you’ll need to assign SKUs to that template. Before you do this, we recommend that you have your fulfillment center already set up and inventory added. You must wait four hours after adding a fulfillment center to your account before you can assign corresponding SKUs for the first time. The system will generate an error if you try before the four hour window passes.
In this guide, we’ll show you how to assign SKUs to your Shipping Template.Â
Assign SKUs
Step 1 — Get started
Navigate to your Catalog in Seller Center. Next, select the Update items button and choose Update with file. 
 Step 2 — Download & complete templateÂ
On the Update with file dialog box, choose Show Walmart templates and select SKUs to shipping template update. Complete the template including SKU ID, Shipping Template ID, Fulfillment Center ID and Action Type columns. 
Step 3 — Upload & submitÂ
Return to the Update items in bulk screen. Upload your completed template. Select the correct template in the field provided and select Submit.Â
You can set up TwoDay to designated regions and sub-regions to accommodate for any shipping constraints.  Please be advised that you're solely responsible for verifying if the products listed under a specific program can be delivered on time. It's your responsibility to determine if there are any constraints such as weight, distance or other factors that may prevent timely shipping as part of that program and to list them accordingly.Â