Copying Alternate Materials
When you copy an alternate material from a current BOM into another current BOM,
the new material in the destination BOM is always created as a primary material. To make
the new material an alternate in the destination BOM, change the new material's Alt Group
appropriately before you save the new record.
When you copy a current operation into another current routing/BOM, any alternate materials specified in the source operation are copied to the destination BOM as alternate materials. However, when you copy a current operation to any other type of routing/BOM (such as a job or production schedule routing/BOM), alternate materials are NOT copied to the destination BOM.