Importing Build Items

In our business, we use manually created Build Items instead of Auto-Build Items for various reasons. Some of the transactions for these manually built items take significant time to input, so I was hoping to streamline the process by importing them from an Excel file.

However, I have only found the option to export/import Inventory Adjustments, which does not appear to be the same as Build Items.  The inclusion of the Account Number for Inventory Adjustments appears to be the difference.

I noticed that I am unable to export Build Items directly, which further leads me to believe that Build Items and Inventory Adjustments are handled differently. Could you provide guidance or confirm if there is a way to import/export Build Items more efficiently?

I attach a document with two diagrams depicting the screens I am referring to.