Change Class System [Modify class system] dialog: In the case of mode "Whole", changing a Class ID does not affect the subclasses. These are free and independent of its parent element (which is displayed as a prefix).

Setting:

Change class system [Modify class system] > Tabbed page Display > Key mode "Whole"

Change of the class ID:

The exemplary figure shows a change of the ID from "01" to "01-A"

Result in comparison between < V12.8 and V12.8:

< V12.8: The subclasses have adopted the change to the class

V12.8: The subclasses remain unchanged

Details on editing the class system can be found under Section 5.12.12, “Create or edit your own class system ” in eCATALOG 3Dfindit