QB Issue Resolution:

gear>tools>export data

then import in the second file

what you can export and import is limited and you must use IE to do it

Resolution for Issue 'how to import list data from one qboe file to another qboe file' available: Yes (Solved).
Source: Intuit Community forum.

how to import list data from one qboe file to another qboe file: 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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