QB Issue Resolution:

QBO is designed to buy and sell a widget nothing more, so the work around is use a concept called work in progress, WIP

create a cash type bank account called WIP
create a vendor called inhouse
post all costs to make the item to that account

when you have a final qty of the finished item
use the cash account to “buy” the finished inventory item from the inhouse vendor, that stocks it with all costs

Resolution for Issue 'How to account for Manufacturing costs + Raw Materials in the COGS of a final inventory item?' available: Yes (Solved).
Source: Intuit Community forum.

How to account for Manufacturing costs + Raw Materials in the COGS of a final inventory item?: this 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 issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

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