QB Issue Resolution:

You can have as many companies as you need. To see previous ones. go to File > Open previous company. At the bottom click on Set Number of Previous Companies and increase the number.

Resolution for Issue 'Is there a maximum number of companies I can have in quickbooks?' available: Yes (Solved).
Source: Intuit Community forum.

Is there a maximum number of companies I can have in quickbooks?: 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.

Support for Maximum number of companies
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Error Recovery for Maximum number of companies [Canada]
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