Yes, click on the Gear > Chart of Accounts > New to add a new bank account. You do not have to connect it to download transactions.
Resolution for 'a bank issue: 'Can I manually enter a bank account?' available: Yes.
The a bank 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 a bank issue yourself by looking for a resolution described in the article. If it is a complex a bank issue or you are unable to solve the issue, you may contact us by clicking here or by using other a bank support options.
For more information about resolving issues related to a bank in Quickbooks/QBO or to get support for the issue 'Can I manually enter a bank account?', click the link below: