QB Issue Resolution:

You can also import Products and Services (Items) from Excel spreadsheet.

From the home page screen > Company Gear (upper-corner) > “Import Data” under Tools

Check it out. It may work better for you.

Resolution for Issue 'How do I copy items ? I want to copy existing items to create new ones and then edit tem, saving me to retype all the information.' available: Yes (Solved).
Source: Intuit Community forum.

How do I copy items ? I want to copy existing items to create new ones and then edit tem, saving me to retype all the information.: 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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