There is no bulk way to do it.

plus menu>inventory qty adjustment,and select the item to be adjusted for qty – value of the adjustment goes to the adjusting account you select – inventory shrinkage is the default, a cogs type account and us the usual account for end of year […]

Resolution for 'bulk inventory issue: 'What’s the fastest way to do bulk inventory edits?' available: Yes.

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

For more information about resolving issues related to bulk inventory in Quickbooks/QBO or to get support for the issue 'What’s the fastest way to do bulk inventory edits?', click the link below: