QB Issue Resolution:

I definitely understand how you’re trying to bring in a new Product/Service List, rather than add even more items to the list. You’re absolutely right, at this time, there’s no way to batch edit or mass delete your Product/Services List in QuickBooks Online. The only way to delete those items would be to go through the Product/Service List, click the item to select it, and then click Delete at the top of the list. I know this is going to be time consuming for you, and I’m really sorry about that. If you’d like for our developers to implement this option so we might have it available in the future, we can do that by clicking the gear in the upper right corner of your Home screen and choosing Feedback from the dropdown. I’ll make the same suggestion on my side through my channels as well. We update a lot, so just let our engineers know, and let’s see what we can get in a later release!

Resolution for Issue 'bulk edit products.' available: Yes (Solved).
Source: Intuit Community forum.

bulk edit products.: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

Support for item list
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Error Recovery for item list [Canada]
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