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Currently, we're unable to customize an item in QuickBooks Self-Employed. You'll want to add your item specification in the description column. Let me guide you how.
Please see these articles for more information about:
What's new with QuickBooks Self-Employed Invoicing?
You can also visit our site for more helpful articles about QuickBooks Self-Employed.
If there's anything else you need help with, please don't hesitate to reach out. The Community is always here to help. Thanks for posting and have a wonderful day.