I appreciate your follow-up on this, Brent530. Let me share some insights about building assembly items in QuickBooks Desktop.

Building Assemblies will pull components from your inventory and reduce the quantities. Based on your scenario, I suggest checking the dates. The date of the new build should be after the previous build of the items in BOM. You can refer to this article for more info: Combine your inventory items to build finished goods (assemblies).

Moreover, I'm adding this article for your future task in QuickBooks Desktop: Adjust your inventory quantity or value.

Keep us posted about any additional concerns. The Community is always around to answer them for you.