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Pleased to have you here, @rms0304.
Let me share some information with you on how importing works in QuickBooks Online.
When you import your customer's list to QuickBooks, it will not override the formation that was already recorded in your account.
For additional insights, you may check out this article: FAQs about importing data to QuickBooks Online.
If you need further help with importing your customer's list, I'd recommend contacting our Customer Care Team. A specialist will be able to further assist you via secured remote access session.
Here's how to contact us:
Keep me posted if you have other questions about importing lists in QuickBooks Online. I'd be happy to answer all your inquiries.