Only enterprise in the US version has that option, If you have enterprise, check in menu edit>preferences
Resolution for 'auto fill issue: 'Can I automatically set a class to auto fill automatically when I enter a bill?' available: Yes.
The auto fill 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 auto fill issue yourself by looking for a resolution described in the article. If it is a complex auto fill issue or you are unable to solve the issue, you may contact us by clicking here or by using other auto fill support options.
For more information about resolving issues related to auto fill in Quickbooks/QBO or to get support for the issue 'Can I automatically set a class to auto fill automatically when I enter a bill?', click the link below: