Amazon & Walmart Variant Bulk Listings Help

I’m ready to launch a group of products on both Amazon Seller Central and Walmart Seller Center and I need the listings built correctly from the start. Each item comes in multiple sizes / colors, so the job is not just basic copy-paste—it’s a full variation build with clean parent-child structure on Amazon and the equivalent variant group on Walmart.

Need your help to setup an bulk upload for a single product for both amazon and walmart, I have GTIN and ASIN exemption.

• set up the parent SKU and every child SKU so shoppers can switch smoothly among options
• craft keyword-focused titles, key features, descriptions, backend search terms, and attributes that comply with platform rules
• choose the correct categories and variation themes to avoid listing errors or suppressions
• upload everything (via flat file) and leave the listings active with no stranded or incomplete SKUs

I value proven know-how over lengthy proposals, so please share concise evidence of your experience handling variation listings on both platforms. If you can point to live listings you created, even better.

Once the single listings are live and error-free, the project is complete; I’ll verify that each child shows under the parent and that the Walmart and Amazon variant group displays properly.