You can select products, export their BOMs into a CSV file; amend the consumptions ('Quantity' column) and/or comments, and import it back into Zedonk to update your BOMs.
Product Costing - Data Import - Update BOMs
You can select products, export their BOMs into a CSV file; amend the consumptions ('Quantity' column) and/or comments, and import it back into Zedonk to update your BOMs.