QB Issue Resolution:

You can not do that in QB.

An assembly item build does not allow for waste or drops.  The assembly item uses the complete item in the BOM

Resolution for Issue 'How to find out the materials left in department?' available: Yes (Solved).
Source: Intuit Community forum.

How to find out the materials left in department?: 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 BOM
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