I always think of defending what the accounting shows to an auditor a couple of years from now, for that reason I would not juggle cost

delete the assembly item build

a non inventory item must be check marked as being used in an assembly and the expense and income accounts selected […]

Resolution for 'assemble issue: 'Can you do an inventory adjustment to change the cost but not quantity of inventory? An item used to assemble goods was set up with wrong cost. Unassemble & reassemble?' available: Yes.

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

For more information about resolving issues related to assemble in Quickbooks/QBO or to get support for the issue 'Can you do an inventory adjustment to change the cost but not quantity of inventory? An item used to assemble goods was set up with wrong cost. Unassemble & reassemble?', click the link below: