how to clean cast iron List Cleanup

by:Longzhao BBQ     2019-06-21
Hi, I recently started working in a new company.My list is not split properly.Is there any easy way to clean up the list?Ideally I would like to split them into two different customer groups (retail and wholesale customers) and then I can further break down based on the purchase history etc.I would like to send an email inviting people on my list to update their profile and preferences.Is there a simpler way to sort my list?What is best practice in this case?Thank you very much for your help.
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