Amazon Product Listing Expert for variation using falt file

I am urgently seeking an experienced Amazon Listing Expert with specific, advanced knowledge of using Flat Files (Inventory Loaders) for product variation creation.

The Goal: To successfully create a parent-child listing with color and size variations for a line of kids' socks.

What You Will Do:

I will provide you with a partially completed Flat File template.

Your sole responsibility is to accurately and correctly complete the Flat File to establish the Parent-Child relationship, linking all variations (size and color) under a single parent SKU.

The final file must be ready for immediate upload to Seller Central.
What You Will NOT Do:

You are NOT required to perform any keyword research, title writing, description creation, or image sourcing.

I already have all necessary data: Keywords, Titles, Descriptions, Images, and EAN/UPC equivalents.

Important Requirements:

GTIN Exemption: I currently operate under a GTIN Exemption for a specific brand name (I do not have a registered trademark). You must be proficient in correctly listing products with GTIN exemption through the flat file.

Urgency & Deliverability: This is an extremely time-sensitive task. I need the completed, error-free Flat File INSTANTLY (within a few hours of contract). Do not apply if you cannot deliver immediately.

Payment & Process:

I will share the template and all product data upon contract agreement.

Payment will be made INSTANTLY upon confirmation that the uploaded Flat File has created the listing with the correct variations on Amazon Seller Central without any errors.

If you are an absolute expert in Amazon Flat Files and variation creation, can handle GTIN-exempt listings, and can deliver this critical file now, please contact me immediately with your estimated turnaround time.