When you started the new company, did you continue with the old checking acct? Normally, you would start a new checking acct.
You will have to delete the transactions one at a time or start a new file importing transactions only from July 1 forward.
Resolution for '2016 issue: 'Can I delete first 6 months of 2016???' available: Yes.
The 2016 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 2016 issue yourself by looking for a resolution described in the article. If it is a complex 2016 issue or you are unable to solve the issue, you may contact us by clicking here or by using other 2016 support options.
For more information about resolving issues related to 2016 in Quickbooks/QBO or to get support for the issue 'Can I delete first 6 months of 2016???', click the link below: