Hi Try to modify excel macro in the App "Excel bulk creating Diagrams in Control Builder M" I posted, so that the macro will modify the source code of all Diagrams in the Application. This macro is using CB Open Interface.
There is a shortcoming - I am afraid it is not possible to save modified Diagram source code back to the CBM by CBOI. Likely only one way is to delete Diagrams and insert modified Diagrams again by macro. Is it a production system ? If it was a development system, maybe it would be possible.
Also I am not sure whether coldretains can survive deletion and inserting the same Diagrams back...
Perhaps I can prepare this macro for you but not now , maybe in few days.