Locking a Bill of Materials You can lock a bill of materials (BOM) to prevent unwanted changes to the BOM. To lock a bill of materials: Click a table cell, row, or column. Click the lock in the context toolbar. To unlock, click the lock in the context toolbar. Parent topicBill of Materials Overview Example of Bill of Materials Setting Options for a Bill of Materials Inserting a Bill of Materials into a Drawing Inserting a Bill of Materials into an Assembly or Part Displaying the BOM Assembly Structure Excluding Assembly Components from a Bill of Materials Item Number in a BOM Table Replaced Component Item Numbers in BOMs Changing the Value of a Custom Property in a BOM BOM Overrides