This setting ensures that you map all Shopify Sales Orders to a Single Customer in Xero.
If you choose YES, all the sales orders in Xero would be linked to one customer - Shopify Sales. You can choose to rename this customer’s name according to your needs.For more information : Click Here
If you choose NO, all the sales orders will be linked to the corresponding customer as reported in Shopify.
Note: If you enable this setting, your customers will not be created in Xero.