What I would like to know is, is there a way to do it in a single or multiple batches?

No, there is no batch edit for that, if you can do it at all it is one item at a time.

Resolution for 'Bulk Adjustment issue: 'Can I perform a Bulk Adjustment of invetory start date, and if so, how?' available: Yes.

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

For more information about resolving issues related to Bulk Adjustment in Quickbooks/QBO or to get support for the issue 'Can I perform a Bulk Adjustment of invetory start date, and if so, how?', click the link below: