Component Changes
While an assembly is open in Large Design Review, you can make changes to its components. You can use Filter Modified Components to visually indicate which components have been modified.
To make changes to a component, right-click it in the FeatureManager design tree and click Open Part 
. The component opens in a separate window where you can modify the component and save the changes.
In Large Design Review, you cannot edit components in the context of the assembly.