Welcome to the Community space, @ATCPower. I'll share details on what will happen to your existing inventory if you import new inventory through an Excel file inside QuickBooks Online (QBO).
When you plan to import the same products inside your company file, it'll overwrite your existing inventory with identical details. However, importing new products won't affect those items or services you already have inside the program. If you're ready to start, I'll gladly write down the steps to get you going:
For more details, please see this page: Import products and services into QuickBooks Online.
On the other hand, I recommend checking this article to help you keep track of your products and services inside the program: Set up and track your inventory in QuickBooks Online.
It has been a pleasure having you join us today. Our Community team is ready to help with any QuickBooks-related questions you may have in the future. Please don't hesitate to visit us or comment below for additional support. Have a good day.
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