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Good Afternoon, @suz62.
I'm here to help get the new customers you made to vendors. All you need to do is add them as a vendor and make the customer inactive afterward. Here's how:
Make the Customer inactive
Here are two extra links that can provide some additional information on this matter.
If you run into any trouble along the way, just let me know. I'm always here to lend a helping hand. Enjoy the rest of your day!