Editing Named BOMs You can edit the content and structure of a named BOM. Each time you check in a named BOM after editing, you create a new version of the BOM. SOLIDWORKS PDM maintains the version and revision history for each named BOM. To edit a named BOM: From the main pane, select the item or file. On the Bill of Materials tab, from BOM, select the named BOM. Click Check Out .The background in the BOM list turns white indicating the BOM is editable. Edit the BOM as needed and click Save . Click Check In .The background in the BOM list turns gray indicating the BOM is read-only. You can view the version history of a named BOM from the History dialog box. Contents Updating Named BOMs You can update a named BOM to a selected version of the source file or item. Reordering BOM Components You can change the order of components in a BOM. Adding Columns You can add a column to a named BOM. Adding Rows You can add rows to a named BOM. Modifying Columns You can modify a named BOM column name and column attributes. You cannot modify the source variable for the column. Hiding Rows or Columns You can hide and show any row or column in a named BOM. Filtering Named BOMs You can filter named BOMs so that only rows that match an expression appear. Adding Position Numbers You can add position numbers to a named BOM. Parent topicNamed BOMs Related tasks Creating Named BOMs