eBay Sales Channel, existing eBay listings

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I am new to using sales channels and have a question with existing eBay listings.

I have been selling on eBay for years and have existing listings that I would like to sync with Shopify. Can I grab those listings and bring them to Shopify or do I have to create all listings on Shopify then to eBay?

I am assuming this would be the same for Amazon, Walmart Marketplace etc.