No. Create a table for each unique type of entity in your system: a Customer, perhaps an Address, an Item for sale, and an Order. Then create a table for each one to many relationship in the system. An Order contains many Items, so you need an Order_Items table.
Then to add an order, find the Customer's id (creating a Customer or using an existing one). Create a new Order. Add a row to the Order_Items table for each Item in the Order.
Every unique entity in the system should occur only once in the system. That's basically the normalization rule to go by.
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