SQL Developer Data Modeler

How to export models to xls (xlsx) files which could then be used to "Update model with previously exported XLS (XLSX) file"

This choice can be found with right mouse click on relation design in the Designs --> Relational Models,

Both alternatives of DataModeler installs have the same list of choices:

SqlDeveloper --> DataModeler --> File --> Export

DataModeler --> File --> Export

     To Data Modeller Design

     DDL File

     Cube Views Metadata

     To Microsoft XMLA

     To Oracle AW

     To CSV

     To Reporting Schema

But can't figure out how to e.g. modify and use the CSV files exported in such way that they could be used to update the model.

rgrds Paavo