QB Issue Resolution:

Quickbooks data files can be merged by using a merge tool or a third-party service. A merge tool such as the Data Transfer Utility from Q2Q.us can be used to merge simple data files. If the merge is complex, a third-party service can be used. Since the Quickbooks SDK does not support the import of Payroll data, the merge will usually import payroll data as regular checks with all the check details.

Quickbooks Merge Service

Resolution for Issue 'How to Merge 2 Quickbooks files?' available: Yes (Solved).
Source: Intuit Community forum.

How to Merge 2 Quickbooks files?: 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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