QB Issue Resolution:
Not sure what you are asking
there is one chart of accounts in any business
you can make sub accounts, by check marking that this account is a sub account of and selecting the parent account – you do this on the account screen
Resolution for Issue 'Can I add a new chart of accounts to an existing account' available: Yes (Solved).
Source: Intuit Community forum.
Can I add a new chart of accounts to an existing account: 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 account screen
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Error Recovery for account screen [Canada]
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