You might want to look into the Customer Details sub-section when creating customers in the Sales Tab.
When you are creating a new customer or editing an old one, you can see that there are many fields to enter information such as phone number and address.
There is one that is titled Other, have you considered that you could enter the Customer Code in this field?
I'm not 100% certain if this suits your needs but there is no other way to create a custom field for customers, so let us know if you needed something different.
Hello there, @terrymcc.
I can see how beneficial it is for you to be able to include the Customer Code when importing your customer's list. This would make tracking of your customers transaction a lot more easier and faster. Currently, this is not available.
I'll make sure to pass along your request to the Product Development Team. Meanwhile, i you have any suggestions, feedbacks and product requests for improvement, you can directly send it to us. Here’s how:
Also, you can visit our QuickBooks Blog so you'd be updated on the latest product updates, improvements and feature releases.
Drop your comments below if you have other questions or concerns. I'll be here to ensure your success.