Hi Mihály,
Your request for the import/export of Excel is valid, however I think to solve your problem, you simply need to develop a custom UI for selecting columns instead of relying on selection in the diagram. It would most likely be a tree, which 1st level showing all tables in the project, and columns of each table when its node is expanded. It would require a little more code and it is not that easy if you are not familiar with Java Swing. But don’t worry, I will give you sample code to demonstrate how it can be done. Please be patient.
Best Regards,
Antony.
