QB Issue Resolution:
Although QuickBooks Online Plus doesn’t handle inventory assemblies as discussed in your original post, the closest feature available is inventory bundling. This groups together multiple products/services that are sold in one single package: https://quickbooks.intuit.com/blog/whats-new/improving-your-efficiency-introducing-quickbooks-bundle….
For additional resources on setting up inventory tracking, cost accounting, and COGS, please feel free to check out the following articles: https://community.intuit.com/articles/1145670 and https://community.intuit.com/articles/1145499.
Resolution for Issue 'Double inventory when entering qty and COGS for raw inventory asset. How to adjust?' available: Yes (Solved).
Source: Intuit Community forum.
Double inventory when entering qty and COGS for raw inventory asset. How to adjust?: 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.Support for cost accounting
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Error Recovery for cost accounting [Canada]
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