There are several enhancements to BOM tables when used with assemblies.
Do Not Change Item Numbers Respects Replace Component
If you select Do not change item numbers in the BOM PropertyManager and you change the file name (for example, using Save As or Replace Component) within the referenced assembly, the BOM table retains the BOM item number of the original component being replaced.
New Settings for Replaced Components
You can define how to handle replaced components in BOM table. In the BOM PropertyManager, in the Keep Missing Item section, Replaced components defines how to handle replaced components when you select Keep Missing Item, regardless of the Do not change item numbers setting.