to unbuild an assembly item, bring up the build assembly screen, use the back arrow top left to cycle back to the build you want to delete, use menu edit>delete build when that build is on screen.
all parts used in the assembly item BOM will return to stock
Resolution for 'back arrow issue: 'Un Build Assembly' available: Yes.
The back arrow 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 back arrow issue yourself by looking for a resolution described in the article. If it is a complex back arrow issue or you are unable to solve the issue, you may contact us by clicking here or by using other back arrow support options.
For more information about resolving issues related to back arrow in Quickbooks/QBO or to get support for the issue 'Un Build Assembly', click the link below: