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For now, turning off the supplemental income is unavailable. You'll want to export the Transactions page to Excel and manually separate the supplement income from the income earned
I've got a sample screenshot for a visual guide:
The other way is to categorize your transactions. You can read this article for more details: Categorize transactions in QuickBooks Self-Employed.
I'll be around if you have any follow-up questions or other concerns. Thanks.
I preferred the 2nd suggestion .. thank you