QB Issue Resolution:

Tip#1 is to use Google Chrome browser on navigating the new QuickBooks.

Yes, you can import inventory with quantity on hand from Excel.

To do this task, from the homepage screen

Select the Company “Gear” (upper-corner)
Select “Import Data” under Tools
Select “Products and Services” under Import Data
They provide a sample file. Download a sample file.
Select “Choose File” under Upload you file
Follow the instructions.

Resolution for Issue 'Can I import inventory with quantity on hand from Excel spreadsheet into the new QuickBooks Online?' available: Yes (Solved).
Source: Intuit Community forum.

Can I import inventory with quantity on hand from Excel spreadsheet into the new QuickBooks Online?: 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.

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