The only way to do that is with a third party transaction utility like data transfer on this page

Resolution for 'consolidate 3 issue: 'how do i consolidate 3 “companies” into 1 on QB 2013?' available: Yes.

The consolidate 3 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 consolidate 3 issue yourself by looking for a resolution described in the article. If it is a complex consolidate 3 issue or you are unable to solve the issue, you may contact us by clicking here or by using other consolidate 3 support options.

For more information about resolving issues related to consolidate 3 in Quickbooks/QBO or to get support for the issue 'how do i consolidate 3 “companies” into 1 on QB 2013?', click the link below: