Shopify Supplier Product Upload

My Shopify store is set up and now needs four new suppliers added, each in its own dedicated collection so shoppers can browse strictly by supplier. I already hold the full product information, but it is only available for copy-paste rather than in a tidy CSV... (Budget: $250 - $750 USD, Jobs: Data Entry, Data Processing, Excel, Inventory Management, Product Management, Shopify, Shopify Development, Shopify Templates, Web Development, Web Scraping)