To start over.

https://community.intuit.com/articles/1145429-how-do-i-delete-all-my-data-and-start-over-from-scratch-us-only

Resolution for 'account set issue: 'Can you please reset the Quickbook as new start. but don’t change account set which i have made. only the value (amount)?' available: Yes.

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

For more information about resolving issues related to account set in Quickbooks/QBO or to get support for the issue 'Can you please reset the Quickbook as new start. but don’t change account set which i have made. only the value (amount)?', click the link below: