When changes are made to an object supertype's layout in Vlocity, these changes can be propagated to all products linked to the object subtypes in the hierarchy by clicking the "Propagate" button located on the Layout page. This function ensures that any modifications to the layout of a supertype are consistently and efficiently applied throughout the related object hierarchy, maintaining uniformity and reducing the need for manual updates across multiple product entries. This feature streamlines the management of layout changes, enhancing the administrative efficiency in Vlocity CPQ environments.